Latest content added for UNT Digital Library Partner: UNT Libraries Government Documents Departmenthttps://digital.library.unt.edu/explore/partners/UNTGD/browse/?sort=date_d&fq=untl_decade:1920-1929&fq=str_title_serial:United+States+Bureau+of+Mines+Reports2017-07-14T06:39:54-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT Libraries Government Documents DepartmentThe Canadian Gypsum Industry2017-07-14T06:39:54-05:00https://digital.library.unt.edu/ark:/67531/metadc784355/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc784355/"><img alt="The Canadian Gypsum Industry" title="The Canadian Gypsum Industry" src="https://digital.library.unt.edu/ark:/67531/metadc784355/small/"/></a></p><p>From introduction: The production of gypsum is one of the oldest industries in Canada, and in point of gypsum output Canada ranks third among the countries of the world. Gypsum was discovered in the Maritime Provinces at a very early date, but there is no authentic record..of production until about 1822, when gypsum was mined on a small scale in Ontario. Since.then the production has grown slowly but steadily to more than a million tons. In 1928 the output was 1,205,846 short tons, valued at $3,622,007.</p>Method and Cost of Mining the Thick Freeport Coal in a Second Western Pennsylvania Mine2017-07-14T06:39:54-05:00https://digital.library.unt.edu/ark:/67531/metadc784354/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc784354/"><img alt="Method and Cost of Mining the Thick Freeport Coal in a Second Western Pennsylvania Mine" title="Method and Cost of Mining the Thick Freeport Coal in a Second Western Pennsylvania Mine" src="https://digital.library.unt.edu/ark:/67531/metadc784354/small/"/></a></p><p>From introduction: The purpose of this paper is to present a detailed description of the methods employed and the equipment used, with the results obtained in the operation of this mine in the thick Freeport bed on the northern end of the field, near the Alleghegny-Butler county line in western Pennsylvania. It may be classed as a captive mine, as the largest portion of the product is consumed at the by-product plants of the parent company</p>Ocher and Ochery Earths2016-02-24T16:27:17-06:00https://digital.library.unt.edu/ark:/67531/metadc100843/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100843/"><img alt="Ocher and Ochery Earths" title="Ocher and Ochery Earths" src="https://digital.library.unt.edu/ark:/67531/metadc100843/small/"/></a></p><p>Report about ocher or ochery earth, "a natural mineral pigment composed largely of clay permeated with hydrated iron (ferric oxide)" (p. 2). It includes information about the uses of choer, substitutes, artificial ocher, mining and local deposits, import and export of ocher, and related information.</p>Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof2012-12-13T05:09:55-06:00https://digital.library.unt.edu/ark:/67531/metadc67001/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc67001/"><img alt="Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof" title="Review of State Mine Inspector's Reports as They Relate to Accidents from Falls of Roof" src="https://digital.library.unt.edu/ark:/67531/metadc67001/small/"/></a></p><p>Report issued by the U.S. Bureau of Mines over state mine inspection reports from 19 U.S. states. The information in the reports includes details of accidents, locations that specific accidents occurred, and proposed remedies for prevention of future accidents. This report includes tables.</p>Survey of Gravities of Domestic Crudes2016-02-24T16:27:17-06:00https://digital.library.unt.edu/ark:/67531/metadc100842/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100842/"><img alt="Survey of Gravities of Domestic Crudes" title="Survey of Gravities of Domestic Crudes" src="https://digital.library.unt.edu/ark:/67531/metadc100842/small/"/></a></p><p>Report on the comparative gravities of oil extracted from different regions of the United States.</p>Bauxite: Float-and-Sink Fractionations and Flotation Experiments2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12484/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12484/"><img alt="Bauxite: Float-and-Sink Fractionations and Flotation Experiments" title="Bauxite: Float-and-Sink Fractionations and Flotation Experiments" src="https://digital.library.unt.edu/ark:/67531/metadc12484/small/"/></a></p><p>From Introduction: "This report presents the results of an investigation of the physical properties and characteristics of bauxite, with special reference to the possibility of applying commercial methods of concentration to low-grade bauxite."</p>Bibliography of Petroleum and Allied Substances, 1922 and 19232010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12469/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12469/"><img alt="Bibliography of Petroleum and Allied Substances, 1922 and 1923" title="Bibliography of Petroleum and Allied Substances, 1922 and 1923" src="https://digital.library.unt.edu/ark:/67531/metadc12469/small/"/></a></p><p>From Introduction: "This bulletin is the seventh in this series of petroleum bibliographies published by the Bureau of Mines, Bulletins 149, 165, 180, 189, 216, and 220 being complications for the years 1915, 1916, 1917, 1918, 1919-20, and 1921, respectively. In this bulletin the same general plan of classification of references has been followed, but several additions have been made."</p>Carburetion of Combustible Gas with Butane and Propane-Butane Mixtures with Particular Reference to the Carburetion of Water Gas2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38771/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38771/"><img alt="Carburetion of Combustible Gas with Butane and Propane-Butane Mixtures with Particular Reference to the Carburetion of Water Gas" title="Carburetion of Combustible Gas with Butane and Propane-Butane Mixtures with Particular Reference to the Carburetion of Water Gas" src="https://digital.library.unt.edu/ark:/67531/metadc38771/small/"/></a></p><p>Report issued by the Bureau of Mines over the carburetion of many different fuels. The report pays particular attention to the carburetion of water gas. Carburetion methods and results are presented and discussed. This report includes tables, and illustrations.</p>Coal-Mine Ventilation Factors2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12463/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12463/"><img alt="Coal-Mine Ventilation Factors" title="Coal-Mine Ventilation Factors" src="https://digital.library.unt.edu/ark:/67531/metadc12463/small/"/></a></p><p>Report discussing results from investigations of coal mining ventilation and discussing problems of ventilation in coal mining.</p>Coal-Washing Investigations: Methods and Tests2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12474/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12474/"><img alt="Coal-Washing Investigations: Methods and Tests" title="Coal-Washing Investigations: Methods and Tests" src="https://digital.library.unt.edu/ark:/67531/metadc12474/small/"/></a></p><p>From Introduction: "The investigations described in this bulletin are confined to a study of the washing characteristics of bituminous coals. The washing characteristics of coals from many of the most important coal-producing fields of the Eastern and Central States were examined."</p>Drilling and Blasting in Metal-Mine Drifts and Crosscuts2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12483/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12483/"><img alt="Drilling and Blasting in Metal-Mine Drifts and Crosscuts" title="Drilling and Blasting in Metal-Mine Drifts and Crosscuts" src="https://digital.library.unt.edu/ark:/67531/metadc12483/small/"/></a></p><p>From Introduction: "This report shows the results obtained and conclusions drawn from observing the blasting of 108 rounds at 13 mines in six different States. Kinds of rock drills, drill steel, and forms of drill bits are not considered."</p>Factors Governing the Entry of Solutions into Ores During Leaching2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66450/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66450/"><img alt="Factors Governing the Entry of Solutions into Ores During Leaching" title="Factors Governing the Entry of Solutions into Ores During Leaching" src="https://digital.library.unt.edu/ark:/67531/metadc66450/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over studies on the leaching of copper-bearing ores. As stated in the introduction, the "penetration of the leaching medium into the body of the ore particles" (p. 1) is discussed. This paper includes tables, photographs, and illustrations.</p>Facts Relating to the Production and Substitution of Manufactured Gas for Natural Gas2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38775/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38775/"><img alt="Facts Relating to the Production and Substitution of Manufactured Gas for Natural Gas" title="Facts Relating to the Production and Substitution of Manufactured Gas for Natural Gas" src="https://digital.library.unt.edu/ark:/67531/metadc38775/small/"/></a></p><p>Report issued by the Bureau of Mines over information obtained on manufactured gas production instead of natural gas production. The information collected is discussed. This includes such topics as rates, methods, and locations of gas. This report includes tables, maps, illustrations, and photographs.</p>Flow of Gases Through Beds of Broken Solids2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38776/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38776/"><img alt="Flow of Gases Through Beds of Broken Solids" title="Flow of Gases Through Beds of Broken Solids" src="https://digital.library.unt.edu/ark:/67531/metadc38776/small/"/></a></p><p>Report issued by the Bureau of Mines over studies conducted on the effects of vapor flow through beds of broken solids. Methods and results of the studies are presented and discussed. This report includes tables, illustrations, and photographs.</p>Fuel-Efficiency Tests on Batch Oil Stills2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12475/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12475/"><img alt="Fuel-Efficiency Tests on Batch Oil Stills" title="Fuel-Efficiency Tests on Batch Oil Stills" src="https://digital.library.unt.edu/ark:/67531/metadc12475/small/"/></a></p><p>From Introduction Need for Tests: "This bulletin presents in condensed form the results of these tests and the deductions made from them. The tests were made at two refineries, designated here at plant 1 and plant 2."</p>Graphical Terrane Correction for Gravity Gradient2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66454/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66454/"><img alt="Graphical Terrane Correction for Gravity Gradient" title="Graphical Terrane Correction for Gravity Gradient" src="https://digital.library.unt.edu/ark:/67531/metadc66454/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over formula corrections to make up for gravity gradients. The new formulas are presented and discussed in detail. This paper includes tables, and illustrations.</p>Inspection and Testing of Mine-Type Electrical Equipment for Permissibility2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12478/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12478/"><img alt="Inspection and Testing of Mine-Type Electrical Equipment for Permissibility" title="Inspection and Testing of Mine-Type Electrical Equipment for Permissibility" src="https://digital.library.unt.edu/ark:/67531/metadc12478/small/"/></a></p><p>From Introduction: "This publication, therefore, proposes to discuss the theory upon which tests of equipment in explosive atmospheres are based and to consider inspection and other matters pertaining to complete investigations of machines under Schedules 2B and 15."</p>Iron Oxide Reduction Equilibria: A Critique from the Standpoint of the Phase Rule and Thermodynamics2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38773/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38773/"><img alt="Iron Oxide Reduction Equilibria: A Critique from the Standpoint of the Phase Rule and Thermodynamics" title="Iron Oxide Reduction Equilibria: A Critique from the Standpoint of the Phase Rule and Thermodynamics" src="https://digital.library.unt.edu/ark:/67531/metadc38773/small/"/></a></p><p>Report issued by the Bureau of Mines over studies conducted on iron oxide reduction. As stated in the scope of bulletin, "this bulletin, therefore, presents the properties of the common oxides of iron, their combinations with each other, and the reduction-equilibrium diagrams by which the investigator passes from one to the next; the end point is not pure iron but the carburized iron of the blast furnace, cast iron" (p. 1-2). This report includes tables, and illustrations.</p>Metal-Mine Accidents in the United States During the Calendar Year 19272010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12482/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12482/"><img alt="Metal-Mine Accidents in the United States During the Calendar Year 1927" title="Metal-Mine Accidents in the United States During the Calendar Year 1927" src="https://digital.library.unt.edu/ark:/67531/metadc12482/small/"/></a></p><p>Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.</p>Metallurgical Limestone: Problems in Production and Utilization2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12473/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12473/"><img alt="Metallurgical Limestone: Problems in Production and Utilization" title="Metallurgical Limestone: Problems in Production and Utilization" src="https://digital.library.unt.edu/ark:/67531/metadc12473/small/"/></a></p><p>From Introduction: "The purpose of this report is to cover as completely as possible our present knowledge of the utilization of metallurgical stone and the problems connected with its quarrying or mining and preparation."</p>Methods, Costs, and Safety in Stripping and Mining Coal, Copper Ore, Iron Ore, Bauxite, and Pebble Phosphate2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12472/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12472/"><img alt="Methods, Costs, and Safety in Stripping and Mining Coal, Copper Ore, Iron Ore, Bauxite, and Pebble Phosphate" title="Methods, Costs, and Safety in Stripping and Mining Coal, Copper Ore, Iron Ore, Bauxite, and Pebble Phosphate" src="https://digital.library.unt.edu/ark:/67531/metadc12472/small/"/></a></p><p>From Extent of Open-Pit Mining and Purpose of this Publication: "Various methods and machines are employed, and costs are low; in fact, costs have to be low because coal and ores command a low price on the market. These factors, together with queries on methods and costs of stripping and the increase in open-pit mining, have justified investigation by the Bureau of Mines for this form of mining and publication of the results in this report."</p>Mining Methods and Practice in the Michigan Copper Mines2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12479/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12479/"><img alt="Mining Methods and Practice in the Michigan Copper Mines" title="Mining Methods and Practice in the Michigan Copper Mines" src="https://digital.library.unt.edu/ark:/67531/metadc12479/small/"/></a></p><p>From Introduction: "The mining methods described and discussed in this report have been considered historically-that is, from early to present practice. The data for this report were collected during 1927."</p>Ochers and Mineral Pigments of the Pacific Northwest : Occurrence, Possible Methods of Preparation, and Testing of Ochers, Siennas, and Colored Clays2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12477/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12477/"><img alt="Ochers and Mineral Pigments of the Pacific Northwest : Occurrence, Possible Methods of Preparation, and Testing of Ochers, Siennas, and Colored Clays" title="Ochers and Mineral Pigments of the Pacific Northwest : Occurrence, Possible Methods of Preparation, and Testing of Ochers, Siennas, and Colored Clays" src="https://digital.library.unt.edu/ark:/67531/metadc12477/small/"/></a></p><p>From Introduction: "A review is given of the nomenclature, sources, imports, statistics, common methods of preparation, and testing of mineral pigments. A description of the Deer Park-Spokane colored-clay district and the laboratory methods of preparation of these colored clays, ochers, and siennas follows. The following report is merely preliminary in nature, only three months during the summer of 1927 being devoted to the laboratory investigation."</p>Oxides in Pig Iron: Their Origin and Action in the Steel-Making Process2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12480/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12480/"><img alt="Oxides in Pig Iron: Their Origin and Action in the Steel-Making Process" title="Oxides in Pig Iron: Their Origin and Action in the Steel-Making Process" src="https://digital.library.unt.edu/ark:/67531/metadc12480/small/"/></a></p><p>From Introduction: "In summarizing the evidence in the literature it is apparent that there is general agreement among furnace men on the existence of so-called "bad-iron." It is also evident that the existence of dissolved or occluded gases is not an explanation. The presence of suspended oxides has been proved, and at least one plausible explanation for their formation has been given."</p>Permissible Storage - Battery Locomotives and Power Trucks2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12485/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12485/"><img alt="Permissible Storage - Battery Locomotives and Power Trucks" title="Permissible Storage - Battery Locomotives and Power Trucks" src="https://digital.library.unt.edu/ark:/67531/metadc12485/small/"/></a></p><p>From Introduction: "The purpose of this paper is therefore to give essential data in regard to the construction of approved storage-battery locomotives and power trucks."</p>Petroleum Refinery Statistics: 19272012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38774/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38774/"><img alt="Petroleum Refinery Statistics: 1927" title="Petroleum Refinery Statistics: 1927" src="https://digital.library.unt.edu/ark:/67531/metadc38774/small/"/></a></p><p>Report issued by the Bureau of Mines over statistical records kept on petroleum refineries during 1927. Statistical information on different forms of petroleum is discussed. This report includes tables.</p>Quarry Accidents in the United States During the Calendar Year 19272010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12486/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12486/"><img alt="Quarry Accidents in the United States During the Calendar Year 1927" title="Quarry Accidents in the United States During the Calendar Year 1927" src="https://digital.library.unt.edu/ark:/67531/metadc12486/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Rock Bursts in the Lake Superior Copper Mines, Keweenaw Point, Michigan2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12481/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12481/"><img alt="Rock Bursts in the Lake Superior Copper Mines, Keweenaw Point, Michigan" title="Rock Bursts in the Lake Superior Copper Mines, Keweenaw Point, Michigan" src="https://digital.library.unt.edu/ark:/67531/metadc12481/small/"/></a></p><p>From Introduction: "The effect of rock pressure may be general and continuous disintegration and reduction in size of pillars of ore and rock left for the support of the workings, resulting in the collapse of hanging wall and the closing of stopes, drifts, and shafts, or the action may be sudden and violent and aside from seriously affecting the workings may present a real hazard to the operation of mines. The object in the preparation of this report is to add to the accumulated information and from the facts presented to make suggestions for protective measures to be taken when possible."</p>Salvage of Material in the Oil Industry2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66458/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66458/"><img alt="Salvage of Material in the Oil Industry" title="Salvage of Material in the Oil Industry" src="https://digital.library.unt.edu/ark:/67531/metadc66458/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over the salvage of necessary equipment for the oil industry. The types of materials that can be salvaged are presented and discussed. This paper includes photographs, and illustrations.</p>Subsidence and Ground Movement in the Copper and Iron Mines of the Upper Peninsula, Michigan2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38772/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38772/"><img alt="Subsidence and Ground Movement in the Copper and Iron Mines of the Upper Peninsula, Michigan" title="Subsidence and Ground Movement in the Copper and Iron Mines of the Upper Peninsula, Michigan" src="https://digital.library.unt.edu/ark:/67531/metadc38772/small/"/></a></p><p>Report issued by the Bureau of Mines over studies conducted on the ground movement and support failure of Michigan mines. Factors involved in surface subsidence in the mines are discussed. This report includes tables, maps, illustrations, and photographs.</p>Tests of Strength of Roof Supports Used in Anthracite Mines of Pennsylvania2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12476/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12476/"><img alt="Tests of Strength of Roof Supports Used in Anthracite Mines of Pennsylvania" title="Tests of Strength of Roof Supports Used in Anthracite Mines of Pennsylvania" src="https://digital.library.unt.edu/ark:/67531/metadc12476/small/"/></a></p><p>From Introduction: "The report that follows gives the results to determine the comprehensive strength of artificial roof supports of various kinds used in the mining of anthracite in Pennsylvania."</p>Coal-Mine Fatalities in the United States, 19272010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12471/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12471/"><img alt="Coal-Mine Fatalities in the United States, 1927" title="Coal-Mine Fatalities in the United States, 1927" src="https://digital.library.unt.edu/ark:/67531/metadc12471/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>Experiments in Underground Communication Through Earth Strata2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66438/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66438/"><img alt="Experiments in Underground Communication Through Earth Strata" title="Experiments in Underground Communication Through Earth Strata" src="https://digital.library.unt.edu/ark:/67531/metadc66438/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over studies in mine safety and communication. The methods and equipment used in the studies are presented and discussed. This paper includes tables, illustrations, and photographs.</p>Five Hundred Tests of Various Coals in House-Heating Boilers2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12455/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12455/"><img alt="Five Hundred Tests of Various Coals in House-Heating Boilers" title="Five Hundred Tests of Various Coals in House-Heating Boilers" src="https://digital.library.unt.edu/ark:/67531/metadc12455/small/"/></a></p><p>From Introduction Purpose of Tests: "The tests on which this report is based were made during or before 1917 to obtain a measure of relative heating value and burning characteristics of the various fuels when burned in domestic heating furnaces with attendance comparable to that given ordinarily. In all, 184 different shipments of coals, of which 172 were from various mines in this country, were burned in four low-pressure heating boilers; 534 individual tests were made. The primary object of tests was to report on each individual coal, but it was considered advisable to summarize the results to if any general deductions could be made. This report gives some of the results of this study in condensed form."</p>Geophysical Prospecting: Some Electrical Methods2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66442/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66442/"><img alt="Geophysical Prospecting: Some Electrical Methods" title="Geophysical Prospecting: Some Electrical Methods" src="https://digital.library.unt.edu/ark:/67531/metadc66442/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over experiments in electrical methods. The methods and equipment used are presented and described. This paper includes tables, illustrations, and photographs.</p>Leakage from High-Pressure Natural-Gas Transmission Lines2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12445/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12445/"><img alt="Leakage from High-Pressure Natural-Gas Transmission Lines" title="Leakage from High-Pressure Natural-Gas Transmission Lines" src="https://digital.library.unt.edu/ark:/67531/metadc12445/small/"/></a></p><p>From Scope of Report: "With the cooperation of the Natural Gas Association of America, therefore, the Bureau of Mines has made a scientific study of leakage losses. The fundamental purpose of a study has been to gather information that will aid operating companies in their leakage problems and as a result to conserve natural gas for domestic and industrial consumption instead of allowing it dissipated into the air."</p>Limits of Inflammability of Gases and Vapors2012-08-31T21:48:36-05:00https://digital.library.unt.edu/ark:/67531/metadc38770/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38770/"><img alt="Limits of Inflammability of Gases and Vapors" title="Limits of Inflammability of Gases and Vapors" src="https://digital.library.unt.edu/ark:/67531/metadc38770/small/"/></a></p><p>Report issued by the Bureau of Mines over studies conducted on the inflammability of the gases found in mines. As stated in the introduction, "it is the object of this paper to present the results of a critical review of all figures published on the limits of inflammability of combustible gases and vapors when in admixture with air, oxygen, or other "atmosphere" (p. 1). This report includes tables, and illustrations.</p>Measuring the Variation of Ground Resistivity with a Megger2012-10-17T09:47:01-05:00https://digital.library.unt.edu/ark:/67531/metadc66446/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66446/"><img alt="Measuring the Variation of Ground Resistivity with a Megger" title="Measuring the Variation of Ground Resistivity with a Megger" src="https://digital.library.unt.edu/ark:/67531/metadc66446/small/"/></a></p><p>Technical paper issued by the Bureau of Mines over tests conducted on ground resistivity with a megger. The results of the tests are presented and discussed. This paper includes tables, and illustrations.</p>Metal-Mine Accidents in the United States During the Calendar Year 19262010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12470/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12470/"><img alt="Metal-Mine Accidents in the United States During the Calendar Year 1926" title="Metal-Mine Accidents in the United States During the Calendar Year 1926" src="https://digital.library.unt.edu/ark:/67531/metadc12470/small/"/></a></p><p>Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.</p>Precipitation of Lead and Copper from Solution on Sponge Iron2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12459/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12459/"><img alt="Precipitation of Lead and Copper from Solution on Sponge Iron" title="Precipitation of Lead and Copper from Solution on Sponge Iron" src="https://digital.library.unt.edu/ark:/67531/metadc12459/small/"/></a></p><p>From abstract of Bulletin: "The results of the experiments described in this bulletin are largely a record of the behavior of sponge iron as precipitant of lead and copper under laboratory conditions comparable to those that would obtain in a commercial plant were it attempted to secure the maximum contact of surface between solution and precipitant."</p>Production and Development Problems in the Powell Oil Field, Navarro County, Texas2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12462/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12462/"><img alt="Production and Development Problems in the Powell Oil Field, Navarro County, Texas" title="Production and Development Problems in the Powell Oil Field, Navarro County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc12462/small/"/></a></p><p>From Introduction: "The Mexia-Powell fault fields have long held the attention of the oil industry, and this report proposes to present information on these fields and to interpret it for the consideration and guidance of all persons concerned in further development of the area. Detailed study of this field was made primarily to obtain a better working knowledge of the major features, involving structural conditions, the character and nature of the Woodbine pay sand, and the source of water."</p>Production of High-Alumina Slags in the Blast Furnace2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc146562/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc146562/"><img alt="Production of High-Alumina Slags in the Blast Furnace" title="Production of High-Alumina Slags in the Blast Furnace" src="https://digital.library.unt.edu/ark:/67531/metadc146562/small/"/></a></p><p>Technical report issued by the U.S. Bureau of Mines discussing the results of investigations studying the effects of alumina composition on the viscosity of iron slag.</p>Quarry Accidents in the United States During the Calendar Year 19262010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12466/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12466/"><img alt="Quarry Accidents in the United States During the Calendar Year 1926" title="Quarry Accidents in the United States During the Calendar Year 1926" src="https://digital.library.unt.edu/ark:/67531/metadc12466/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Safety in Coal Mining: A Handbook2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc38815/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc38815/"><img alt="Safety in Coal Mining: A Handbook" title="Safety in Coal Mining: A Handbook" src="https://digital.library.unt.edu/ark:/67531/metadc38815/small/"/></a></p><p>Report issued by the Bureau of Mines discussing safety measures adopted by mining operations in the United States. As stated in the introduction, "this report deals solely with accidents in coal mines and with the means of prevention that have been determined and officially approved by the bureau" (p. 2). This report includes tables.</p>Tabulated Analyses of Representative Crude Petroleums of the United States2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12468/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12468/"><img alt="Tabulated Analyses of Representative Crude Petroleums of the United States" title="Tabulated Analyses of Representative Crude Petroleums of the United States" src="https://digital.library.unt.edu/ark:/67531/metadc12468/small/"/></a></p><p>From Scope of Report: "The present bulletin therefore can be considered as one of series which, taken as a whole, will present a comprehensive picture of the characteristics of crude petroleum. Its main purpose is to present analyses of more than 300 typical crude oils, all produced within the United States."</p>Thermodynamic Properties of Oxygen and Nitrogen2013-02-28T19:56:32-06:00https://digital.library.unt.edu/ark:/67531/metadc66481/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66481/"><img alt="Thermodynamic Properties of Oxygen and Nitrogen" title="Thermodynamic Properties of Oxygen and Nitrogen" src="https://digital.library.unt.edu/ark:/67531/metadc66481/small/"/></a></p><p>Report issued by the Bureau of Mines discussing the thermodynamics of oxygen and nitrogen. Properties of these elements and methods of estimating thermodynamic data are presented. This report includes tables.</p>Practical Underground Education of the Coal Miner2016-02-24T16:27:17-06:00https://digital.library.unt.edu/ark:/67531/metadc100841/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100841/"><img alt="Practical Underground Education of the Coal Miner" title="Practical Underground Education of the Coal Miner" src="https://digital.library.unt.edu/ark:/67531/metadc100841/small/"/></a></p><p>Report describing information that should be provided for miners when they are first being trained on-site, as well as an explanation about the education program offered by the Practical Mining School at Dawson, New Mexico.</p>Regulations and Inspection Prevent Accidents from Falls of Roof2016-02-24T16:27:17-06:00https://digital.library.unt.edu/ark:/67531/metadc100840/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100840/"><img alt="Regulations and Inspection Prevent Accidents from Falls of Roof" title="Regulations and Inspection Prevent Accidents from Falls of Roof" src="https://digital.library.unt.edu/ark:/67531/metadc100840/small/"/></a></p><p>Report on the need for regulations and inspections to counter preventable mine roof collapses and resulting injuries and fatalities.</p>Reduction Mills in Montana in 19252016-02-24T16:27:17-06:00https://digital.library.unt.edu/ark:/67531/metadc100839/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc100839/"><img alt="Reduction Mills in Montana in 1925" title="Reduction Mills in Montana in 1925" src="https://digital.library.unt.edu/ark:/67531/metadc100839/small/"/></a></p><p>List of reduction mills in Montana, compiled in the course of investigations of mineral resources of Montana. It includes information about each loaction including: the process, character of ore, when the mill was operated, and custom work; equipment and power used; and capacity in tons.</p>Acid Processes for the Extraction of Alumina2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12446/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12446/"><img alt="Acid Processes for the Extraction of Alumina" title="Acid Processes for the Extraction of Alumina" src="https://digital.library.unt.edu/ark:/67531/metadc12446/small/"/></a></p><p>Report presenting the Bureau of Mines' investigation into acid processes of extracting alumina. The paper discusses the sulphuric acid processes and other work with hydrochloric and nitric acids so that the comparative advantages can be appreciated.</p>