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Analytical methods for computing the polar curves of airplanes
This report presents a method of calculating polar curves which is at least as precise as graphical methods, but it more rapid. Knowing the wind tunnel test of a wing and the performances of an airplane of the same profile, it is easy to verify the characteristic coefficients and, at the same time, the methods determining induced resistances.
Date:
March 1921
Creator:
Le Sueur
Object Type:
Report
System:
The UNT Digital Library
Petroleum Laws of All America
Report issued by the Bureau of Mines covering petroleum laws of the U.S. and surrounding oil producing countries. As stated in the preface, "this bulletin includes the petroleum laws of (1) United States; (2) the several oil-producing States; (3) Canada; (4) Mexico; (5) the Republics of Central and South America" (p. iv).
Date:
March 1921
Creator:
Thompson, Joseph Wesley
Object Type:
Report
System:
The UNT Digital Library
The Art of Writing Scientific Reports
As the purpose of the report is to transmit as smoothly and as easily as possible, certain facts and ideas, to the average person likely to read it, it should be written in a full and simple enough manner to be comprehended by the least tutored, and still not be boring to the more learned readers.
Date:
March 1921
Creator:
Norton, F. H.
Object Type:
Report
System:
The UNT Digital Library
Development of Aeronautical Engines by the Army and Navy
Different aircraft engines are categorized as being of interest to only the Army or Navy or to both armed services. A listing of the different engines is presented along with some statistics, namely, horsepower.
Date:
March 3, 1921
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Rumpler Passenger Airplane
This report details the Rumpler Limousine which was a further development of the well known type 5 A 2. The fuselage, engine, cabin, wings, controls, and landing gear are all discussed.
Date:
March 1921
Creator:
Langsdorff, Werner v.
Object Type:
Report
System:
The UNT Digital Library
The Law Relating to Air Currents
In the subdivided wing section profile, the diagram of the current is entirely changed and the harmful formation of eddies is avoided through premature deflection. Pressure equalization does not occur between the upper and under sides. This report presents a discussion of the various laws relating to wing design with the conclusion being that lift increases with more acute angles of attack.
Date:
March 1921
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Goebel Rotary Engine
This report presents a table of specifications of the rotary engine and a very brief description of some of the notable features such as the exhaust valves controlled by means of a fixed cam gear.
Date:
March 1921
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Abacus Giving the Variation of the Mean Pressure of an Aviation Engine as a Function of its Speed of Rotation
Comparing the results of the calculations for computing the mean pressure of an aviation engine for any number of revolutions, with those of experiment, the writer, by numerous examples, shows the perfect agreement between them. This report will show that, by means of a special abacus, an engineer can instantly plot the characteristics of an engine.
Date:
March 1921
Creator:
Margoulis, W.
Object Type:
Report
System:
The UNT Digital Library
The Factors That Determine the Minimum Speed of an Airplane
The author argues that because of a general misunderstanding of the principles of flight at low speed, there are a large number of airplanes that could be made to fly several miles per hour slower than at present by making slight modifications. In order to show how greatly the wing section affects the minimum speed, curves are plotted against various loadings. The disposition of wings on the airplane slightly affects the lift coefficient, and a few such cases are discussed.
Date:
March 1921
Creator:
Norton, F. H.
Object Type:
Report
System:
The UNT Digital Library
Influence of Span and Load Per Square Meter on the Air Forces of the Supporting Surface
"It should be clear that in order to obtain a lift it is necessary that the air which flows past an aerofoil be given a downward acceleration; indeed the lift can be only the reaction produced by the downward acceleration of the flowing air. The motion of the air in the neighborhood of an aerofoil may be followed theoretically with great exactness. In the following, it will be undertaken to make understood, through the simplest possible considerations, the effect of span and loading on the air force on an aerofoil, and while these do not form a strong proof of the correctness of the formulae developed, yet they explain the essential features of the phenomena" (p. 1).
Date:
March 1921
Creator:
Betz, A.
Object Type:
Report
System:
The UNT Digital Library
Extract From a Report on the Resistance of Spheres of Small Diameter in an Airstream of High Velocity
Much attention is given here to the design of the wind tunnel and the experimental set-up. In comparing their results on the wind resistance of spheres to the results of other researchers, the authors find wide discrepancies. They are unable to explain the cause of the discrepancies, concluding, as they do, that the differing results could not be explained by the action of the wind tunnel walls.
Date:
March 1921
Creator:
Toussaint & Hayer
Object Type:
Report
System:
The UNT Digital Library
Bale-Tie Buckle
Patent for new and valuable improvements on bale-tie buckles for cotton bales. This relates to buckles securing ties on cotton bales and minimize injury to the persons handling the cotton.
Date:
March 22, 1921
Creator:
McFarland, Frank Hays
Object Type:
Patent
System:
The Portal to Texas History
Airplane Crashes: Engine Troubles: A Possible Explanation
The aim was to bring attention to what might be the cause of some aircraft accidents for which there was no satisfactory explanation. The author notes that in testing aircraft accidents at the Bureau of Standards, it happened frequently that the engine performance became erratic when the temperature of the air entering the carburetor was between 0 C and 20 C. Investigation revealed the trouble to have been caused by the formation and collection of snow somewhere between the entrance to the carburetor and the manifold, probably at the throttle.
Date:
March 1921
Creator:
Sparrow, Stanwood W.
Object Type:
Report
System:
The UNT Digital Library
Window-Sash Gearing and Lock
Patent for a window sash mechanism that allows the upper and lower portions of a window to be adjusted and locked independently of each other.
Date:
March 1, 1921
Creator:
Peaden, William H.
Object Type:
Patent
System:
The Portal to Texas History
Well-Drilling Device.
Patent for well drilling device with new and useful improvements in well-drilling device for simultaneously drilling the main hole and an advance or "rat-tail" hole.
Date:
March 1, 1921
Creator:
Smith, Primus W. & Bookhout, John J.
Object Type:
Patent
System:
The Portal to Texas History
Embroidery-Needle.
Patent for an embroidery needle that is simplified version for easy use and avoid complications. The embroidery needle has a better grip for the user.
Date:
March 15, 1921
Creator:
Pade, George V. & Neitzel, Conrad T.
Object Type:
Patent
System:
The Portal to Texas History
Record-Printing Device.
Patent for record printing device that is used on cars for mechanics to record the car number and other data. The printing device is more durable especially though rough weather and easy to use by the mechanic.
Date:
March 22, 1921
Creator:
Gray, Dexter B.
Object Type:
Patent
System:
The Portal to Texas History
Lateral-Wear Reducer for Locomotives.
Patent for lateral wear reducer for locomotives that prevent or reduces wear on the train wheels.
Date:
March 29, 1921
Creator:
Paxton, Thomas
Object Type:
Patent
System:
The Portal to Texas History
Boat.
Patent for boat with improvements towards easy movements by using a propeller and rudder. The boat is designed with the user to use their feet to manually move the boat. The boat is designed for hunting or fishing while keeping the hands free.
Date:
March 8, 1921
Creator:
Greer, John C.
Object Type:
Patent
System:
The Portal to Texas History
Vehicle-Body
Patent for new and useful improvements in vehicle bodies - a vehicle for carrying groceries, vegetables, and other necessities, as a traveling store.
Date:
March 29, 1921
Creator:
Wieman, Herman A,
Object Type:
Patent
System:
The Portal to Texas History
Wheel-Tread.
Patent for improvements on tractor wheel tread design, the structure of which was previously submitted by the inventor in 1918. This improved wheel tread makes the structure stronger and more compact.
Date:
March 29, 1921
Creator:
Ingram, Joseph D.
Object Type:
Patent
System:
The Portal to Texas History
Tractor
Patent for an improved tractor where the "propelling force is delivered through traction blocks...(lines 11-12)."
Date:
March 22, 1921
Creator:
Aerl, Van Vivian
Object Type:
Patent
System:
The Portal to Texas History
Spike-Extractor
Patent for a spike extractor that consists of a gripper and spring legs with inturned jaws.
Date:
March 8, 1921
Creator:
Hector, Olinthus H.
Object Type:
Patent
System:
The Portal to Texas History
Process of Forming Individual Foot-Forms and Fitting Shoes Thereon.
Patent for the improvement of the process of forming individual foot forms or replicas of a person's specific foot. This alleviates a person having to go through the painful process of breaking in new shoes. The foot forms can then either be kept by the individual or by the shoe dealer for making future foot wear.
Date:
March 22, 1921
Creator:
Butler, James B.
Object Type:
Patent
System:
The Portal to Texas History