Technical Report Archive & Image Library (TRAIL) - 356 Matching Results
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- International Conference of Mine-Experiment Stations: Pittsburgh, Pennsylvania, U.S.A., September 14-21, 1912.
- Report discussing an international conference on mine-experiment stations assembling in Pittsburgh, Pennsylvania. The United States sent invitations to countries that had mine-experiment stations, Great Britain and Canada were the only countries, that did not accept invitation.
- An Introduction to the Laws of Air Resistance of Aerofoils
- Report presents methods of calculating air resistance of airfoils under certain conditions of flow phenomena around the airfoil.
- An Investigation of Explosion-Proof Motors
- Procedure of Investigation: "The investigation described in this bulletin was undertaken by the Bureau of Mines as one of several investigations having for their purpose the ascertaining of methods for lessening the risks attending the use of electricity in mining. In this report the results of tests are related to the various types of protection employed which are described in detail."
- Investigation of Pitot Tubes
- Report describes the principles of operation and characteristics of some of the instruments which have been devised or used to measure both low and high speeds of aeroplanes. Since the pitot tube is the instrument which has been most commonly used in the United States and Great Britain as a speedometer for aeroplanes, it is treated first and somewhat more fully than the others.
- An Investigation of the Elements Which Contribute to Statical and Dynamical Stability, and of the Effects of Variation in Those Elements
- Part 1 gives details of models tested and methods of testing of the Eiffel 36 wing alone and the JN2 aircraft. Part 2 presents a statistical analysis of the following: lift and drag contributed by body and chassis tested without wings; lift and drag contributed by tail, tested without wings; the effect on lift and drift of interference between the wings of a biplane combination; lift and drag contributed by the addition of body, chassis, and tail to a biplane combination; total parasite resistance; effect of varying size of tail, keeping angle of setting constant; effect of varying length of body and size of tail at the same time, keeping constant moment of tail surface about the center of gravity; forces on the tail and the effects of downwash; effect of size and setting of tail on statical longitudinal stability effects of length of body on stability; the effects of the various elements of an airplane on longitudinal stability and the placing of the force vectors. Part 3 presents the fundamental principals of dynamical stability; computations of resistance derivatives; solution of the stability equation; dynamical stability of the Curtiss JN2; tabulation of resistance derivatives; discussion of the resistance derivatives; formation and solution of stability equations; physical conceptions of the resistance derivatives; elements contributing to damping and an investigation of low speed conditions. Part 4 includes a summary of the results of the statistical investigation and a summary of the results for dynamic stability.
- Investigations of Balloon and Aeroplane Fabrics
- Report presents the experimental results of fabrics used for balloons and aeroplanes. Tensile properties, surface roughness, skin friction, flammability, permeability, and water absorption were tested for different combinations of materials.
- Investigations of Detonators and Electric Detonators
- From Introduction: "The conclusions are given in this bulletin, which is published by the Bureau of Mines as one of the series of publications dealing with the testing of explosives and the precautions that should be taken to increase safety and efficiency in the use of explosives in mining operations. The results of the experiments described in this bulletin show that the average percentage of failures of explosives to detonate was increased more than 20 per cent when the lower grades of electric detonators were used in instead of No. 6 electric detonators, and was increased more than 50 percent when these lower grades were used instead of No. 8 electric detonators."
- Investigations of Explosives Used in Coal Mines
- Report discussing investigations of explosives used in coal mines throughout the United States.
- 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.
- A Laboratory Study of the Inflammability of Coal Dust
- From Introduction: "Much knowledge has been gained from the work done in the large galleries constructed at official and semiofficial stations in this country and abroad, but the study of the coal-dust problem in these galleries requires so much time and is so costly that there is a need of a reliable laboratory method for obtaining a classification if the great variety of dusts that occur in mines. The investigation described in this paper was an attempt to devise such a method."
- Life Zone Investigations in Wyoming
- Characterizes five transcontinental life zones in Wyoming; defines their extent and limits; lists mammal, breeding bird, reptile, amphibian, and plant species; and provides notes on distribution and abundance of trees observed during the survey.
- Life Zones and Crop Zones of New Mexico
- Discusses geography, climate, agricultural practices, and crops of each life zone in New Mexico. Provides mammal, breeding bird, reptile, amphibian, and plant species list for each zone. Includes a life zone map.
- 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.
- Manufacture and Uses of Alloy Steels
- From Introduction: "The object of this report is to give briefly information of present value relating to the manufacture and uses of the various commercial alloy steels, with the hope of stimulating the demand for such steels and extending their practical use."
- Manufacture of Gasoline and Benzene-Toluene from Petroleum and Other Hydrocarbons
- From Preface: "This bulletin deals with the cracking of petroleum and other hydrocarbons and the production thereby of gasoline, benzene, and toluene."
- Measurement and Specification of the Physical Factors Which Determine the Saturation of Certain Tints of Yellow
- Technical paper issued by the Bureau of Standards over studies conducted on the specifications of color. The specifications of the color yellow are discussed. This paper includes tables, illustrations, and photographs.
- Measurements on the Index of Refraction of Air for Wave Lengths from 2218 A to 9000 A
- Report issued by the Bureau of Standards over measurements of air refraction. Comparison of older studies of this kind is presented. As stated in the introduction, "a brief review of the objects, experimental methods, and results of these earlier investigations will assist in explaining the purpose of this additional investigation on the index of refraction and dispersion of air described in detail in this paper" (p. 698). This report includes tables, illustrations, and photographs.
- Measuring the Temperature of Gases in Boiler Settings
- Scope of Report: "The bulletin presents the results of a series of measurements of the temperatures of gases in the most common types of boilers, discusses the errors occurring in the usual methods of measurement, and gives directions for making and using inexpensive thermocouples to determine flue-gas temperatures."
- Melting Aluminum Chips
- Report concerning the loss of aluminum experienced during the melting process. This report shows the magnitude of the loss through various experiments. Index begins on page 85.
- Melting Brass in a Rocking Electric Furnace
- From Object of Report: "The object of this paper is to set forth in detail the possibilities and limitations of a rocking electric brass furnace. The general problem of electric brass furnaces is discussed and various types of furnaces are compared only so far as is necessary for the purpose of this report."
- Metal-Mine Accidents in the United States During the Calendar Year 1914
- Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the Untied States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked. This report includes tables and illustrations.
- Metallurgical Coke
- Technical paper issued by the Bureau of Mines over studies on metallurgical coke. As stated in the introduction, "in this paper the attempt is made to summarize the history of coke making in the United States, to indicate the development of different methods and the modern types of ovens, and to point out the composition and physical properties of the metallurgical cokes produced in this country" (p. 5). This paper includes tables, illustrations, photographs, and a map.
- Metallurgical Smoke
- From Introduction: "This bulletin is published by the bureau primarily for persons who seek information on the subject of metal-lurgical smoke but are unacquainted with the technical language of metallurgy. The effort is made in this paper to present the problem of metallurgical smoke as it actually exists, without bias of any kind."
- Meteorology and Aeronautics
- A handbook in which properties and general phenomena of the atmosphere which aeronauts and aviators should understand are discussed.
- 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.
- Methods for Increasing the Recovery from Oil Sands
- From Introduction: "In this publication are considered the principles involved in increasing recovery and methods of extracting more oil from the oil-bearing formations than by usual ways of producing. These methods are: The use of gas or vacuum pumps. forcing compressed air or gas through the oil-bearing formations, displacing the oil by water, and better utilization of the natural pressures in the oil-bearing formations."
- Methods of Preventing and Limiting Explosions in Coal Mines
- Technical paper issued by the Bureau of Mines over safety prevention in coal mines. Preventing mine explosions is emphasized. Methods used in mine safety are discussed. This paper includes tables, illustrations, and photographs.
- Methods of Sampling Delivered Coal and Specifications for the Purchase of Coal for the Government
- From Introduction: "This bulletin is a revision of Bulletin 63 and is published by the Bureau of Mines in order that purchasers of coal for Government, State, municipal, or private use may be informed regarded advances or refinements in sampling coal deliveries and preparing specifications for the purchase of coal."
- Methods of Shutting Off Water in Oil and Gas Wells
- Report discussing methods of shutting off water in oil and gas wells in California, the Midwest, and the Gulf. Emphasis is on the methods used in California and suggestions for modifying California methods to make them applicable in other localities.
- The Middle Triassic Marine Invertebrate Faunas of North America
- This is a report on the middle triassic marine invertebrate faunas of North America.
- Mine-Ventilation Stoppings: with Especial Reference to Coal Mines in Illinois
- Purpose of Report: "In this report an attempt is made to discuss the first cost of each of several types of mine-ventilation stoppings, as well as the total annual expenses of maintaining a stopping during its required period of service."
- Mine Workings Under a Part of the Central Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Central Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Central Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Central Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Central Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the East Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Green Ridge Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Green Ridge Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Hyde Park Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Hyde Park Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Hyde Park Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Keyser Valley Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Leggetts Gap Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the North East Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the North Providence Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the North Providence Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Providence Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.
- Mine Workings Under a Part of the Providence Section of the City of Scranton
- Map that illustrates sections of the anthracite coal mines beneath the city of Scranton, Pennsylvania to accompany a bulletin issued by the U.S. Bureau of Mines.