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[Comptroller Taxes, December 18, 1880]

Description: Comptroller taxes of 1880 by Levi Perryman of Montague County. Lists the debts and credits within the county.
Date: December 18, 1880
Creator: Perryman, Levi
Partner: UNT Libraries Special Collections
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[American Shrews]

Description: Brief summary of three genera of American shrews, including characteristics, habits, habitat, and skull, jaws, and teeth illustrations.
Date: December 31, 1895
Creator: Merriam, C. Hart & Miller, Gerrit S. (Gerrit Smith), 1869-1956
Partner: UNT Libraries Government Documents Department
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Graphic Studies of Ultimate Analyses of Coals

Description: Technical paper issued by the Bureau of Mines over studies of analyses of coals. The results are discussed and presented on various diagrams. This paper includes tables, and illustrations.
Date: December 1915
Creator: Ralston, Oliver C. & Porter, Horace C.
Partner: UNT Libraries Government Documents Department
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Quarry Accidents in the United States During the Calendar Year 1915

Description: Technical paper issued by the Bureau of Mines over the quarry accidents during the year of 1915 in the U.S. The locations and types of quarry accidents are presented. This paper includes tables.
Date: December 1916
Creator: Fay, Albert H.
Partner: UNT Libraries Government Documents Department
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Abstracts of Current Decisions on Mines and Mining: May to August, 1917

Description: 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).
Date: December 1917
Creator: Thompson, J. W.
Partner: UNT Libraries Government Documents Department
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Abstracts of Current Decisions on Mines and Mining: May to August, 1917

Description: 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).
Date: December 1917
Creator: Thompson, J. W.
Partner: UNT Libraries Government Documents Department
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Toluol Recovery

Description: Technical paper issued by the Bureau of Standards over toluol-recovery, known as light oil. The methods used in the toluol-recovery are presented and discussed. This paper includes tables, and illustrations.
Date: December 19, 1918
Creator: McBride, R. S.; Reinicker, C. E. & Dunkley, W. A.
Partner: UNT Libraries Government Documents Department
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Thermal Expansion of Insulating Materials

Description: 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.
Date: December 27, 1919
Creator: Souder, Wilmer H. & Hidnert, Peter
Partner: UNT Libraries Government Documents Department
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Design of Recording Wind Tunnel Balances

Description: Given here is a description of the design of a scientific recording wind tunnel balance. It was decided that the most satisfactory arrangement would be a rigid ring completely surrounding the tunnel or wind stream, so that the model could be supported from it by wires or any arrangement of spindles. The forces and moments acting on this ring can then be recorded by suitable weighing apparatus. The methods available for recording forces on the arms are explained. The proposed type of balance will support the model rigidly in a variety of ways, will make a complete test without attention, and will plot the results so that all computations are avoided.
Date: December 1920
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department
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High thermal efficiency in airplane service

Description: Described here is a method by which high average fuel economy has been achieved in aircraft engines. Details are given of the design of certain foreign engines that employ an unusual type of fuel-air ratio control in which the change in power produced by a mixture change is due almost entirely to the change in the power producing ability of the unit weight of the mixture. The safety and performance features of this type of control are explained.
Date: December 1920
Creator: Sparrow, S. W.
Partner: UNT Libraries Government Documents Department
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Instrument for measuring engine clearance volumes

Description: With the advent of the V type engine, a new method to measure the clearance volume in cylinders was needed. It was suggested that this measurement could be made by a process which consisted essentially of simultaneously changing both a known and unknown volume of gas by a known amount and then calculating the magnitude of the unknown from the resulting difference in pressure between the two. An instrument based on this design is described.
Date: December 1920
Creator: Sparrow, S. W.
Partner: UNT Libraries Government Documents Department
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Progress Made in the Construction of Giant Airplanes in Germany During the War

Description: The construction of giant airplanes was begun in Germany in August, 1914. The tables annexed here show that a large number of airplanes weighing up to 15.5 tons were constructed and tested in Germany during the War, and it is certain that no other country turned out airplanes of this weight nor in such large numbers. An examination of the tables shows that by the end of the War all the manufacturers had arrived at a well-defined type, namely an airplane of about 12 tons with four engines of 260 horsepower each. The aircraft listed here are discussed with regard to useful weight and aerodynamic qualities.
Date: December 1920
Creator: Baumann, A.
Partner: UNT Libraries Government Documents Department
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The Steadiness Factor in Engine Sets

Description: Technical notes discussing the steadiness factor in engines and the calculations that can be used to arrive at it. Factors affecting the steadiness factor are detailed, including the mass of parts, torque, engine rotation, and power.
Date: December 1920
Creator: Margoulis, W.
Partner: UNT Libraries Government Documents Department
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A Variable Speed Fan Dynamometer

Description: Fan brakes used as absorption dynamometers in testing internal combustion engines have the disadvantage that a given fan will run only at one speed when the engine is delivering full power. In order to be able to vary the speed at which a given power will be absorbed, English manufacturers have for some time been using a cylindrical housing around the fan with one or two variable openings in the periphery. Here, results are given of tests conducted to determine how great a range of speed can be obtained from such a device.
Date: December 1920
Creator: Wood, Karl D.
Partner: UNT Libraries Government Documents Department
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Dependence of Propeller Efficiency on Angle of Attack of Propeller Blade

Description: In order to determine the maximum and the most favorable pitch for a propeller, it was found desirable to investigate the dependence of propeller efficiency on the angle of attack of the propeller blade. The results of a few experiments are given to show that propeller blades conduct themselves just like airplane wings with reference to the dependence of their efficiency on their angle of attack.
Date: December 1921
Creator: Borck, Hermann
Partner: UNT Libraries Government Documents Department
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Destructive Distillation of Mixtures of Oil and Coal

Description: Report issued by the U.S. Bureau of Mines on the characteristics and behavior of oil and coal distillation processes. The effectiveness of the distillation processes and the properties of the oil and coal mixtures are presented. This report includes tables, graphs, and illustrations.
Date: December 1921
Creator: Davis, Joseph D.; Place, Palmer B. & Scott, G. S.
Partner: UNT Libraries Government Documents Department
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Effects of Varying the Relative Vertical Position of Wing and Fuselage

Description: "The object of this series of experiments was to determine the influence of the relative vertical position of wing and fuselage on the efficiency of the wing. Since the longitudinal position of the wing can be varied but slightly with reference to the center of gravity in a normal airplane, it was kept constant in the experiments to be described and only the vertical position of the wing with reference to the fuselage was varied" (p. 1).
Date: December 1921
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department
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Ground Influence on Aerofoils

Description: The question of ground influence on airplanes has recently attracted some attention in view of the claims made by certain designers that the landing speed of their airplanes is much decreased by an increase in lift coefficient due to the proximity of the ground in landing. The results of wind tunnel tests indicate that ground effect is not entirely beneficial. It decreases the landing speed and cushions the landing shock somewhat. However, it does so at the expense of an increased length of preliminary skimming over the ground.
Date: December 1921
Creator: Raymond, Arthur E.
Partner: UNT Libraries Government Documents Department
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A Mechanical Device for Illustrating Airplane Stability

Description: An instrument is described which will illustrate completely in a qualitative sense the longitudinal stability characteristics of an airplane. The instrument is primarily of use for the lecture room, but it is hoped that ultimately it will be possible to obtain quantitative results from it.
Date: December 1921
Creator: Norton, F. E.
Partner: UNT Libraries Government Documents Department
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Mutual Influence of Wings and Propeller

Description: Report presenting an experiment consisting of an aerofoil and propeller in order to discover the mutual influence between the two components and variations in moment due to the propeller influence.
Date: December 1921
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department
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The Lacasa Area, Ranger District North-Central Texas

Description: This document reports the economic geology of the Lacasa area, Ranger district in North-Central Texas, with fieldwork done in April and May of 1919.
Date: December 23, 1921
Creator: Ross, Clarence S.
Partner: UNT Libraries Government Documents Department
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Airplane performance, past and present

Description: Report discussing the progress of airplane performance and measured by speed.
Date: December 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Balloon Fabrics Made of Goldbeater's Skins

Description: Goldbeater's skin, which is the prepared outside membrane of the large intestine of an ox, is examined as a balloon fabric and details of how goldbeater's skin is prepared for use are provided. The construction techniques employed by Germany, France, and England are all discussed.
Date: December 1922
Creator: Chollet, L.
Partner: UNT Libraries Government Documents Department
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