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18,966 Matching Results
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Natural Gas Resources of Parts of North Texas
Article about Natural Gas Reserves production and Consumption in Dallas, Fort Worth in Texas
Date:
February 1916
Creator:
Shaw, E. W. (Eugene Wesley) & Matson, George Charlton
System:
The Portal to Texas History
Review of the Grizzly and Big Brown Bears of North America (Genus Ursus): with Description of a New Genus, Vetularctos
Discusses distribution,sexual and age differences, specimens, and classification of North American grizzly and big brown bears. Describes and lists locations of species and subspecies. Mentions Vetularctos, a new genus related to Ursus.
Date:
February 9, 1918
Creator:
Merriam, C. Hart
System:
The UNT Digital Library
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.
Date:
February 1919
Creator:
Pickering, J. C.
System:
The UNT Digital Library
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.
Date:
February 1919
Creator:
Hamilton, Walter Raleigh
System:
The UNT Digital Library
A New Interferential Dilatometer
Scientific paper issued by the Bureau of Mines over development of a dilatometer. The instrument is used in tests of thermal expansion. The methods are presented and discussed. This paper includes an illustration.
Date:
February 28, 1920
Creator:
Priest, Irwin G.
System:
The UNT Digital Library
Causes of cracking of ignition cable
From Summary: "The experiments described here show that the cracking at sharp bends, observed in the insulation of internal combustion engine high tension ignition wires after service, is due to a chemical attack upon the rubber by the ozone produced by the electric discharge that takes place at the surface of the cable. This cracking does not occur if the insulating material is not under tension, or if the cable is surrounded by some medium other than air. But it does occur even if the insulation is not subjected to electric stress, provided that the atmosphere near the cable contains ozone. The extent of this cracking varies greatly with the insulating material used. The cracking can be materially reduced by using braided cable and by avoiding sharp bends."
Date:
February 1921
Creator:
Dempsey, J. B. & Silsbee, F. B.
System:
The UNT Digital Library
Commercial Aviation in Germany: Past and Future
This review of commercial aviation includes postal delivery, package transport, and passenger transport. Both airplanes and airships are covered in this review.
Date:
February 1921
Creator:
Wronsky, W.
System:
The UNT Digital Library
The Effect of the Nature of Surfaces on Resistance as Tested on Struts
The chief concern was to measure the variations of resistance brought about by the nature of the surface of the struts. The struts were spanned with aviation linen, and then covered with one coat of varnish. The top surface was not perfectly smooth after this treatment, being slightly rough owing to the threads and raised fibers of the fabric. The results of the measurements of the surfaces are shown by the dotted lines of the curves plotted in several figures.
Date:
February 1921
Creator:
Wieselsberger, G.
System:
The UNT Digital Library
Effect of the Reversal of Air Flow Upon the Discharge Coefficient of Durley Orifices
Experiments were conducted to obtain information on the relationship between the coefficients for flow in two directions through thin plate orifices at low velocities. The results indicate that the ratio of the orifice discharge coefficient from standard orifice C(sub s)(sup 1) to the discharge coefficient from the reverse flow C(sub s) is always less than unity with increasing ratio of box area to orifice area. Even for areas as low as twenty, the ratios of the coefficients are not much less than unity. It is probable, however, that when the ratio of box area is less than twenty, the ratio of discharge coefficients would be greatly reduced. Specific results are given for the case of an apparatus for the laboratory testing of superchargers.
Date:
February 1921
Creator:
Ware, Marsden
System:
The UNT Digital Library
Effect of the Reversal of Air Flow Upon the Discharge Coefficient of Durley Orifices
Note presenting an experiment to obtain information regarding the relationship between the coefficients for flow in the two directions through an inlet. The results indicate that the ratio of the orifice discharge coefficient from standard orifice to the discharge coefficient from reverse flow is always less than unity, but approaches unity with increasing ratio of box area to orifice area, and that even for a ratio of areas as low as twenty the ratios of the coefficients is not much less than unity.
Date:
February 1921
Creator:
Ware, Marsden
System:
The UNT Digital Library
Loads and Calculations of Army Airplanes
By comparing airplanes of known strength that have resisted all the usual and even extreme air loads with those that under like conditions were found to be insufficiently strong, the researchers, aided by scientific investigations, developed standards which are satisfactory for the calculation of airplane structures. Given here are standards applicable to loads on wing trusses, load factors for use in stress analysis, load factors required in sand testing, loads on control surfaces, loads on wing ribs, loads on landing gear, and rigidity of materials.
Date:
February 1921
Creator:
Stelmachowski
System:
The UNT Digital Library
Note on the Resistance of Polished Cylinders (and Cylindrical Wires) With Generatrices Perpendicular to the Airstream
Report presenting a review of currently published documents regarding the resistance of polished cylinders with generators perpendicular to the airstream. The discrepancies between these various studies are pointed out.
Date:
February 1921
Creator:
Toussaint, A.
System:
The UNT Digital Library
Aerial Transportation
Report discussing the origin of air traffic dates from the war. The important development of aeronautic industries and the progress made in recent years, under the impelling force of circumstances, rendered it possible, after the close of hostilities, to consider the practical utilization of this new means of economic expansion.
Date:
February 1922
Creator:
Pierrot
System:
The UNT Digital Library
The Aerodynamical Laboratory of the Vienna Technical High School
Report presenting a description of the aerodynamics laboratory of the Vienna Technical High School. The main focus of this report is detailing some of the accomplishments that the laboratory has made.
Date:
February 1922
Creator:
Katzmayr, R. & Kirste, L.
System:
The UNT Digital Library
Air force and three moments for F-5-L Seaplane
From Introduction: "A model of the F-5-L seaplane was made, verified, and tested at 40 miles an hour in the 8' x 8' tunnel for lift and drag, also for pitching, yawing and rolling moments. Subsequently, the yawing moment test was repeated with a modified fin. The results are reported without VL scale correction."
Date:
February 1922
Creator:
unknown
System:
The UNT Digital Library
Deterioration of Airplane Fabrics
The observation that airplane fabrics, after long use, lose their original strength, caused the German Experimental Institute for Aviation to carry out a series of experiments on the effect of weathering on the cloth covering of airplane wings and fuselages.
Date:
February 1922
Creator:
Wendt, F.
System:
The UNT Digital Library
The Efficiency of a Wind Tunnel
If, by some means, a steady state of motion of a perfect fluid were established in an ideal wind tunnel, there would be no losses, and the motion would persist indefinitely. In the actual tunnel, the function of the motor-fan group is overcome by the total loss of head in the tube due to friction and eddies.
Date:
February 1922
Creator:
Miller, William H.
System:
The UNT Digital Library
Impact Tests for Woods
Although it is well known that the strength of wood depends greatly upon the time the wood is under the load, little consideration has been given to this fact in testing materials for airplanes. Here, results are given of impact tests on clear, straight grained spruce. Transverse tests were conducted for comparison. Both Izod and Charpy impact tests were conducted. Results are given primarily in tabular and graphical form.
Date:
February 1922
Creator:
unknown
System:
The UNT Digital Library
Manometer for Recording Air Speed
If it is desired to record the pressure difference given a gauge, the manometer must answer the following conditions: 1) It must respond quickly so that all speed variations will be correctly recorded; 2) It must not be affected by rectilinear or curvelinear accelerations. Hence, movable parts must be counterbalanced. An instrument which met these criteria is discussed as well as details of construction.
Date:
February 1922
Creator:
Wieselsberger, C.
System:
The UNT Digital Library
Marking Airdromes
Necessity of adopting for all aviation fields, civil or military, a single system of markers for giving the direction for starting and landing (with an automatic indicator of the direction of the wind) and of indicating the good part of the field.
Date:
February 1922
Creator:
James, P.
System:
The UNT Digital Library
Preparation and Uses of Tar and its Simple Crude Derivatives
Technical paper issued by the Bureau of Mines over studies of coal tars. As stated in the introduction, "this paper discusses the uses to which some of the various tars are put and shows briefly the usual methods of working up tar into some of its simple or easily prepared derivatives, for which a market can generally be found" (p. 5). This paper includes tables, illustrations, and photographs.
Date:
February 1922
Creator:
Odell, W. W.
System:
The UNT Digital Library
[Rural School Supervisor's Report, Montgomery County District 15, February 1, 1922: Calman]
Report from the Texas Rural School Supervisor Sally Attwell on the Calman common school, stating that a personal visit was prevented by "impassable" roads and giving county superintendent P. R. Clarke's remarks on the school instead.
Date:
February 1, 1922
Creator:
Attwell, Sally
System:
The Portal to Texas History
[Rural School Supervisor's Report, Montgomery County District 15, February 1, 1922: Gilmore]
Report from the Texas Rural School Supervisor Sally Attwell on the Gilmore common school, stating that a personal visit was prevented by "impassable" roads and giving county superintendent P. R. Clarke's remarks on the school instead.
Date:
February 1, 1922
Creator:
Attwell, Sally
System:
The Portal to Texas History
[Rural School Supervisor's Report, Montgomery County District 15, February 1, 1922: Lost Prairie]
Report from the Texas Rural School Supervisor Sally Attwell on the Lost Prairie common school, stating that a personal visit was prevented by "impassable" roads and giving county superintendent P. R. Clarke's remarks on the school instead.
Date:
February 1, 1922
Creator:
Attwell, Sally
System:
The Portal to Texas History