Technical Report Archive & Image Library (TRAIL) - 356 Matching Results
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- Thermal Expansion of Insulating Materials
- Scientific paper issued by the Bureau of Standards over studies on thermal expansion. Expansivity tests are conducted on many different insulating materials. The results of the tests are discussed. This paper includes tables, photographs, and illustrations.
- Comparison of Alcogas Aviation Fuel With Export Aviation Gasoline
- Mixtures of gasoline and alcohol when used in internal combustion engines designed for gasoline have been found to possess the advantage of alcohol in withstanding high compression without "knock" while retaining advantages of gasoline with regard to starting characteristics. Test of such fuels for maximum power-producing ability and fuel economy at various rates of consumption are thus of practical importance, with especial reference to high-compression engine development. This report discusses the results of tests which compares the performance of alcogas with x gasoline (export grade) as a standard.
- An Apparatus for Measuring the Relative Wear of Sole Leathers, and the Results Obtained with Leather from Different Parts of a Hide
- Technical paper issued by the Bureau of Standards over studies conducted on the quality of sole leather. As stated in the introduction, "the development of a simple method for quickly determining the durability of sole leather seemed desirable, and this paper discusses a laboratory apparatus designed for this purpose and also presents the results of tests made to date to determine the relative wear of leather from different parts of the hide" (p. 3). This paper includes illustrations, and photographs.
- Approximate Quantitative Microscopy of Pulverized Ores, Including the Use of the Camera Lucida
- Technical paper issued by the Bureau of Mines over microscopy of pulverized ores. As stated in the introduction, "this paper, which deals with the study of pulverized ores and the use of the camera lucida in such work, discusses an investigation undertaken at the Seattle and the Golden mining experiment stations of the Bureau of Mines" (p. 3). This paper includes tables, illustrations, and photographs.
- Experiment Stations of the Bureau of Mines
- Report issued by the Bureau of Mines over the eleven experiment stations established near important mining fields. The work done by the stations are discussed. This report includes tables, illustrations, and photographs.
- Explosives and Miscellaneous Investigations
- Report discussing explosives research requested by the U.S. Army and Navy and conducted by the Bureau of Mines.
- Effect of Rate of Temperature Change on the Transformations in an Alloy Steel
- Scientific paper issued by the Bureau of Standards over studies conducted on the effects of temperature change on alloy steel. The experimental methods used and the results are presented and discussed. This paper includes tables, photographs, and illustrations.
- New Forms of Instruments for Showing the Presence and Amount of Combustible Gas in the Air
- Scientific paper issued by the Bureau of Standards over the detection of combustible gases in the air. The design and development of new detection equipment is discussed. This paper includes tables, photographs, and illustrations.
- The Ultra-Violet and Visible Transmission of Eye-Protective Glasses
- Technical paper issued by the Bureau of Standards over studies conducted on the development of protective eye wear. The methods and equipment used are presented and discussed. This paper includes tables, and illustrations.
- Petroleum Investigations and Production of Helium
- Report issued by the Bureau of Mines over studies conducted on petroleum and helium production. The results of the studies are presented and discussed.
- Petroleum Investigations and Production of Helium
- Report discussing petroleum investigations and the production of helium by the Bureau of Mines during World War I.
- Cost Keeping for Small Metal Mines
- Technical paper issued by the Bureau of Mines over the accounting for small metal mines. As stated in the introduction, "this report outlines methods of cost keeping suitable for metal mines of small or moderate size and presents various forms and cost sheets that have been found useful in actual practice" (p. 5). This paper includes tables, and illustrations.
- Traps for Saving Gas at Oil Wells
- Technical paper issued by the Bureau of Mines over the use of gas traps at oil wells. Different types of traps are presented and discussed. This paper includes photographs, and illustrations.
- Abstracts of Current Decisions on Mines and Mining: May to September, 1918
- Bulletin issued by the U.S. Bureau of Mines: "This publication is devoted exclusively to a review and abstracts of decisions based on the laws governing the rights and duties of mine owners, operators, miners, and persons trafficking in all kinds of mining properties. It includes abstracts of current decisions of all the Federal and State courts of last resort on questions relating to the mining industries" (Bulletin 61, p. 9).
- Abstracts of Current Decisions on Mines and Mining: September to December, 1918
- Bulletin issued by the U.S. Bureau of Mines: "This publication is devoted exclusively to a review and abstracts of decisions based on the laws governing the rights and duties of mine owners, operators, miners, and persons trafficking in all kinds of mining properties. It includes abstracts of current decisions of all the Federal and State courts of last resort on questions relating to the mining industries" (Bulletin 61, p. 9).
- Abstracts of Current Decisions on Mines and Mining: January to May 1919
- Bulletin issued by the U.S. Bureau of Mines: "This publication is devoted exclusively to a review and abstracts of decisions based on the laws governing the rights and duties of mine owners, operators, miners, and persons trafficking in all kinds of mining properties. It includes abstracts of current decisions of all the Federal and State courts of last resort on questions relating to the mining industries" (Bulletin 61, p. 9).
- Abstracts of Current Decisions on Mines and Mining Reported from January to May 1918
- Report issued by the Bureau of Mines over mining decisions made between January and May of 1918. Details of the decisions are presented and discussed.
- Airplane Dopes and Doping
- Report details some examples of dopes and doping on airplanes and balloons and the various properties of different materials. Topics covered include cellulose nitrate dopes, cellulose acetate dopes, dope covers, application of dopes, and fireproof dopes
- The Airplane Tensiometer
- Certain parts of an airplane are subjected not only to the stresses imposed by the aerodynamic or flying load, but also to the initial stresses, caused by the tension in the stay and drift wires. Report describes a tensiometer that measures such stresses which is simple in construction, accurate, and easily and quickly operated even by inexperienced persons. Two sizes of the instrument are available. One is suitable for wires up to one-fourth inch in diameter and the other for wires from one-fourth to three-eights inch in diameter.
- Bibliography of Petroleum and Allied Substances in 1916
- From Introduction: " This bibliography follows the same general scheme as the bibliography of petroleum and allied substances for 1915. References to articles in these journals have been taken from such sources as were available and credit has been given to those sources. American and foreign patents have been entered by title, without abstracts. A few minor changes have been made in the scheme of classification, which is, on the whole, the same is given in the 1915 bibliography."
- The Copper Deposits of Ray and Miami, Arizona
- This is a report on the copper deposits of Ray and Miami, Arizona.
- The Decline and Ultimate Production of Oil Wells, with Notes on the Valuation of Oil Properties
- From General Statement Purpose of the Report: "The present investigation was undertaken for the purpose of supplying some of the material so badly needed in the valuation and more efficient operation of oil properties. Because of the lack of time for further studies, the amount of data already accumulated and the policy of the Bureau of Mines of publishing as soon as possible any information that may be of use to an industry, the bulletin is issued now."
- The Design of Wind Tunnels and Wind Tunnel Propellers
- Report discusses the theory of energy losses in wind tunnels, the application of the Drzewiecki theory of propeller design to wind tunnel propellers, and the efficiency and steadiness of flow in model tunnels of various types.
- Effect of Compression Ratio, Pressure, Temperature, and Humidity on Power
- Among other factors which affect the horsepower of an airplane engine are the atmospheric pressure, and consequently the altitude at which the engine is working, and the compression ratio, or cylinder volume divided by clearance volume. The tests upon which this report is based were selected from a large number of runs made during the intercomparison of various gasolines to determine the variation of horsepower with altitude at three different compression ratios. The test results and conclusions are presented in this report.
- Electrodeposition of Gold and Silver from Cyanide Solutions
- From Introduction: "This report on the electrodeposition of gold and silver from cyanide solutions represents work that has occupied my time at intervals during the past 20 years, The investigations has been carried on simultaneously with my duties as professor of mining and metallurgy of the University of California."
- Experimental Research on Air Propellers, 2
- This report is a continuation of NACA Technical Report 14. It presents the results of an experimental investigation on the performance of air propellers which was divided into five parts, as follows: (1) Tests under conditions of flight on 16 model propellers of different forms, sections, or pitch ratios from those of Technical Report 14; (2) Tests under conditions of flight on one model propeller of variable pitch; (3) Tests under conditions of flight on three sets of right and left hand model propellers in series; (4) Tests on 12 model propellers to determine brake effect or negative thrust at negative slip; (5) Standing thrust and power tests of 67 model propellers.
- General Analysis of Airplane Radiator Problems
- Report embodies the results of a very extensive research, both theoretical and experimental, into the problems involved in the dissipation of heat by means of the airplane radiator.
- General Discussion of Test Methods for Radiators
- Report describes the methods and apparatus developed and used in the extensive experimental research into the problems involved in the dissipation of heat by means of the airplane radiator.
- The General Theory of Blade Screws Including Propellers, Fans, Helicopter Screws, Helicoidal Pumps, Turbo-Motors, and Different Kinds of Helicoidal Blades
- Report presents a theory which gives a complete picture and an exact quantitative analysis of the whole phenomenon of the working of blade screws, but also unites in a continuous whole the entire scale of states of work conceivable for a blade screw. Chapter 1 is devoted to the establishment of the system of fundamental equations relating to the blade screw. Chapter 2 contains the general discussion of the 16 states of work which may establish themselves for a blade screw. Chapter 3 is devoted to the study of the propulsive screw or propeller.
- Illinois Mining Statutes Annotated
- Report discussing Illinois mining statutes.
- The Kantishna Region, Alaska
- This report describes the results of expeditions to map the geologic and topographic features of the Kantishna region of Alaska.
- The Kiln Drying of Wood for Airplanes
- This report is descriptive of various methods used in the kiln drying of woods for airplanes and gives the results of physical tests on different types of woods after being dried by the various kiln-drying methods.
- The Limiting Velocity in Falling from a Great Height
- The purpose of this report is to give a simple treatment of the problem of calculating the final or limiting velocity of an object falling in vertical motion under gravity in a resisting medium. The equations of motion are easily set up and integrated when the density of the medium is constant and the resistance varies as the square of the velocity. The results show that the fundamental characteristics of the vertical motion under gravity in a resisting medium is the approach to a terminal or limiting velocity, whether the initial downward velocity is less or greater than the limiting velocity. This method can be used to calculate the terminal velocity of a bomb trajectory.
- Metering Characteristics of Carburetors
- Report presents the results of an extensive experimental investigation of the performance of different types of carburetors as effecting the maintenance under all conditions of correct ratio between the weights of fuel and air. It also gives a description of the Bureau of Standards carburetor test plant, test equipment and measuring instruments used to determine the metering characteristics of carburetors.
- Miners' Safety and Health Almanac for 1920
- Report presenting the Miner's Safety and Health Almanac, which contains a calendar and information on diseases that may affect miners and their families. Some more common causes of accidents in mines and show how the miner can lessen the risks of their work.
- The Oil Fields of Allen County Kentucky, with Notes on the Oil Geology of Adjoining Counties
- From introduction: The purpose of the field work was to investigate the geology of the county, particularly the structure or lay of the oil-bearing strata and the results of drilling to date. Structural conditions in the producing fields were determined by running level lines to the wells and correlating the data recorded in the well logs generously furnished by the operators.
- A Preliminary Report on the Mining Districts of Idaho
- From Introduction: "The bulletin aims to give the localities of the various mining districts, and the nature of the present operations and those that have been carried out in the past."
- Recent Developments in the Absorption Process for Recovering Gasoline from Natural Gas
- From Introduction: "This report gives the results of a study conducted by the Bureau of Mines for the purpose of informing the petroleum industry on the recent progress in the development and application of the absorption process for recovering gasoline from natural gas."
- Recovery of Zinc from Low-Grade and Complex Ores
- From Introduction: "Vocalization in retorts has been, until recently, the only commercial process of producing spelter, hence the zinc mine operators have had to meet the terms of the zinc mine operators have had to meet the terms of the zinc smelters in regard to the following requirements: (1) Minimum percentage of zinc the ore must contain; (2) the chemical combination of the zinc in the ore; (3) the proportion present of those elements that interfere with the successful recovery of the zinc when the ore is retorted. As stated previously, and as will be shown later, a large part of the valuable mineral content of the ore is lost in effecting this concentration. As a result of the other requirements that have to be met in zinc smelting, much zinc is lost in the mining and milling of zinc ore."
- Removal of the Lighter Hydrocarbons from Petroleum by Continuous Distillation: with Especial Reference to Plants in California
- From Introduction: "The purpose of this bulletin is to describe the methods of constructing and operating representative types in the United States used for removing the light hydrocarbons from petroleum by continuous distillation, such plants being commonly known in the trade as topping or skimming plants."
- Report of a Joint Committee Appointed from the Bureau of Mines and the United States Geological Survey by the Secretary of the Interior to Study the Gold Situation: October 30, 1918
- From Introduction: "The report presents statistical data compiled from various sources, showing the production of gold in the United States and other countries, with comparative figures for coal, iron, and other mineral products, and describes the sources and distribution of gold output in the United States."
- Reptilian Faunas of the Torrejon, Puerco, and Underlying Upper Cretaceous Formations of San Juan County, New Mexico
- introduction: The present paper, which in some respects is supplementary to another recent one on the same region, is based on a series of vertebrate remains collected during the field season of 1916 for the United States Geological Survey by J.B. Reeside, jr., and F.R. Clark.
- Saving Coal in Steam Power Plants
- Technical paper issued by the Bureau of Mines over studies conducted on steam power plants. The comparison of using purchased power versus using power from a private plant is discussed. This paper includes illustrations.
- Shorter Contributions to General Geology, 1918
- A collection of writings on the shorter contributions to general geology.
- Some American Jurassic Ammonites of the Genera Quenstedticeras, Cardioceras, and Amoeboceras, Family Cardioceratidae
- Introduction: The interpretation of the data furnished by the study of these fossils has been hindered somewhat because the exact stratigraphic location of much of the material is unknown. It was gathered with regard merely for the general stratigraphic and geographic position. However, as a knowledge of the general relationship forms to those of other areas is in itself of value to the stratigrapher and systematist it has seemed desirable to describe and figure the species.
- The Sunset-Midway Oil Field, California: Part 2. Geochemical Relations of the Oil, Gas, and Water
- Introduction: In the following pages a number of selected analyses or tests of the oil and gas from this field are given, with such descriptions of the analytical methods used as are necessary to an understanding of the results.
- Temperatures in Spark Plugs Having Steel and Brass Shells
- "Brass has often been assumed superior to steel for spark plug shells because of its greater heat conductivity. The measurements described in this report prove the contrary, showing that the interior of a spark plug having a brass shell is from 50 degrees to 150 degrees c. (90 degrees to 270 degrees f.) hotter than that of a similar steel plug. It is to be concluded that steel is to be preferred to brass for spark plug shells. This report embodies the results of measurements taken of electrodes and a comparison of brass and steel insulators of spark plugs while they were in actual operation" (p. 5).
- The Variation of Yawing Moment Due to Rolling
- The aerodynamical constants of an airplane necessary for the discussion of stability are partly observed and partly calculated. Among the calculated coefficients is n(p), which is the variation of yawing moment due to rolling. (author).
- War Gas Investigations: Advance Chapter from Bulletin 178, War Work of the Bureau of Mines
- From General Statement: "Beginning with an investigation to develop the best type of gas mask, the scope of the work extended until it included researches relating to a wide range of devices, such as different types of poisonous and irritating gases and smokes, smoke screens, gas shells and gas bombs, signal lights, and incendiary bombs. When the results obtained through this research were to be applied by the War Department, the Director of the Bureau of Mines cooperated in the selection of men to have charge of manufacture or further development, recommending chemists who subsequently received commissions in the Army. Perhaps the greatest result of the research work has been the demonstration of the value of the services that the chemist and chemical engineer can render in time of need and the recognition of chemical investigations as a necessary function of the Government."
- War Minerals, Nitrogen Fixation and Sodium Cyanide
- Report issued by the Bureau of Mines over investigations conducted on common war minerals. Descriptions of the minerals and their uses are presented.