States

Aerial photography. (open access)

Aerial photography.

A training manual designed to teach aerial photography for military purposes.
Date: July 8, 1941
Creator: United States. War Department.
Object Type: Book
System: The UNT Digital Library
Aluminum-Zinc-Magnesium-Copper Casting Alloys (open access)

Aluminum-Zinc-Magnesium-Copper Casting Alloys

From Introduction: "This paper contains data on the mechanical properties of sand-cast test bars having a considerable range in zinc, magnesium, and copper content and more detailed data on the properties and foundry characteristics of an aluminum-zinc-magnesium-copper alloy having a preferred composition for high strength and ductility."
Date: July 1941
Creator: Kempf, L. W.
Object Type: Report
System: The UNT Digital Library
The biology and control of the sorghum midge. (open access)

The biology and control of the sorghum midge.

Describes the life cycle of the sorghum midge, its history in the United States, the damage it can cause to plants, and the steps farmers can take to control the pest and its damage.
Date: July 1941
Creator: Walter, E. V. (Elmer Valentine), 1891-
Object Type: Book
System: The UNT Digital Library
Comparison of Vee-Type and Conventional Tail Surfaces in Combination with Fuselage and Wing in the Variable-Density Tunnel (open access)

Comparison of Vee-Type and Conventional Tail Surfaces in Combination with Fuselage and Wing in the Variable-Density Tunnel

"The pitching and the yawing moments of a vee-type and a conventional type of tail surface were measured. The tests were made in the presence of a fuselage and a wing-fuselage combination in such a way as to determine the moments contributed by the tail surfaces" (p. 1).
Date: July 1941
Creator: Greenberg, Harry
Object Type: Report
System: The UNT Digital Library
Cooling and Performance Tests of a Continental A-75 Engine (open access)

Cooling and Performance Tests of a Continental A-75 Engine

Note presenting an investigation to determine the performance of a small airplane with two Continental A-75 air-cooled engines enclosed in the wings. The object of the tests was to determine the quantity of air and the pressure difference required for satisfactory cooling of the engine at sea level and at altitude. The engine could be cooled satisfactorily at sea level with wide-open throttle and maximum-power mixture with a pressure difference of 4.5 inches of water and 1.06 pounds of cooling air per second.
Date: July 1941
Creator: Ellerbrock, Herman H., Jr. & Bullock, Robert O.
Object Type: Report
System: The UNT Digital Library
Correction of the Lifting-Line Theory for the Effect of the Chord (open access)

Correction of the Lifting-Line Theory for the Effect of the Chord

"It is shown that a simple correction for the chord of a finite wing can be deduced from the three-dimensional potential flow around an elliptic plate. When this flow is compared with the flow around a section of an endless plate, it is found that the edge velocity is reduced by the factor 1/E, where E is the ratio of the semiperimeter to the span. Applying this correction to the circulation brings the theoretical lift into closer agreement with experiments" (p. 1).
Date: July 1941
Creator: Jones, Robert T.
Object Type: Report
System: The UNT Digital Library
Design charts for cross-flow tubular intercoolers charge-through-tube type (open access)

Design charts for cross-flow tubular intercoolers charge-through-tube type

Report presenting equations relating the various dimensions, air weight flow, and performance of a cross-flow tubular intercooler in which the charge flows through and the cooling air across the tubes. A method of determining and presenting the performance of a given intercooler at various operating conditions is indicated. Results regarding the cooling effectiveness equation, effect of primary intercooler variables, design charts, effect of tube arrangement on intercooler characteristics, and performance charts are provided.
Date: July 1941
Creator: Reuter, J. George & Valerino, Michael F.
Object Type: Report
System: The UNT Digital Library
The Design of Jet Pumps (open access)

The Design of Jet Pumps

This report shows that by applying both energy and impulse theorems the optimum throat dimension of the mixing nozzle and the best shape of intake can be predicted approximately in a relatively simple manner. The necessary length of the mixing nozzle follows from Prandtl's turbulent mixing theory. The calculations are carried out for the mixing of similar and dissimilar fluids.
Date: July 1941
Creator: Flügel, Gustav
Object Type: Report
System: The UNT Digital Library
Drag Measurements of a Protruding 0.50-Caliber Machine Gun (open access)

Drag Measurements of a Protruding 0.50-Caliber Machine Gun

Report presenting drag and cross-wind force measurements of a Browning 0.50-caliber M2 machine gun at a range of air speeds in the NACA wind tunnel. The gun protruded through the top of the tunnel wall into the air stream and tests were performed at a variety of angles in order to determine the power required to turn the gun against the aerodynamic forces and the horsepower absorbed in air drag by the protruding gun. Special attention is given to the jacket around the gun, which seems to provide the greatest amount of drag.
Date: July 1941
Creator: Luoma, Arvo A.
Object Type: Report
System: The UNT Digital Library
Drag of Several Gunner's Enclosures at High Speeds (open access)

Drag of Several Gunner's Enclosures at High Speeds

"The drag of several types of gunner's turrets, windshields, blisters, and other protuberances, including projecting guns, was investigated at speeds from 75 to 440 miles per hour in the NACA 8-foot high-speed wind tunnel. The various gunner's enclosures were represented by 1/10 and 1/7 full-size models on a midwing-fuselage combination representative of bomber types. Most of the usual types of retractable turrets are very poor aerodynamically; they caused wind drag increments, dependent upon the size of the turret relative to the fuselage and upon the speed, up to twice the drag of the fuselage alone" (p. 1).
Date: July 1941
Creator: Stack, John & Moberg, Richard J.
Object Type: Report
System: The UNT Digital Library
The effect of external shape upon the drag of a scoop (open access)

The effect of external shape upon the drag of a scoop

Report presenting testing of six scoops built using the principles of NACA cowling design to show the advantage of using those principles. Three scoops had a good nose contour with different afterbody lengths and three were of inferior nose shape. Results regarding drag, cooling pressure, and surface pressure survey are provided.
Date: July 1941
Creator: Naiman, Irven & Hill, Paul R.
Object Type: Report
System: The UNT Digital Library
The Effect of Various Wing-Gun Installations on the Aerodynamic Characteristics of an Airplane Model Equipped with an NACA Low-Drag Wing, Special Report (open access)

The Effect of Various Wing-Gun Installations on the Aerodynamic Characteristics of an Airplane Model Equipped with an NACA Low-Drag Wing, Special Report

"An investigation was made in the NACA 19-foot pressure wind tunnel to determine the effect of various win-gun installation on the aerodynamic characteristics of a model with an NACA low-drag wing. Measurements were made of lift and drag over an angle-of-attack range and for several values of dynamic pressure on a four-tenths scale model of a high-speed airplane equipped with the low-drag wing and with various wing-gun installations. Two installations were tested: one in which the blast tube and part of the gun barrel protrude ahead of the wing and another in which the guns is mounted wholly within the wing" (p. 1).
Date: July 1941
Creator: Muse, Thomas C.
Object Type: Report
System: The UNT Digital Library
Index to Probate Records of Texas: Number 100, Hardin County, September 9, 1867-March 18, 1939 (open access)

Index to Probate Records of Texas: Number 100, Hardin County, September 9, 1867-March 18, 1939

Index of probate cases housed in Hardin County Courthouse as of September 9, 1867-March 18, 1939, providing information about the holdings and listing names, filing dates, and case numbers for each.
Date: July 1941
Creator: Texas Statewide Records Project
Object Type: Book
System: The Portal to Texas History
Methods of analyzing wind-tunnel data for dynamic flight conditions (open access)

Methods of analyzing wind-tunnel data for dynamic flight conditions

The effects of power on the stability and the control characteristics of an airplane are discussed and methods of analysis are given for evaluating certain dynamic characteristics of the airplane that are not directly discernible from wind tunnel tests alone. Data are presented to show how the characteristics of a model tested in a wind tunnel are affected by power. The response of an airplane to a rolling and a yawing disturbance is discussed, particularly in regard to changes in wing dihedral and fin area. Solutions of the lateral equations of motion are given in a form suitable for direct computations. An approximate formula is developed that permits the rapid estimation of the accelerations produced during pull-up maneuvers involving abrupt elevator deflections.
Date: July 22, 1941
Creator: Donlan, C. J. & Recant, I. G.
Object Type: Report
System: The UNT Digital Library
Monthly Report of the Attorney General of the State of Texas, Volume 3, Number 6, June 1941 (open access)

Monthly Report of the Attorney General of the State of Texas, Volume 3, Number 6, June 1941

Monthly report documenting orders, opinions, and other legal statements issued by the Office of the Attorney General in Texas.
Date: July 1941
Creator: Texas. Attorney-General's Office.
Object Type: Report
System: The Portal to Texas History
New Method of Calculating the Power at Altitude of Aircraft Engines Equipped With Superchargers on the Basis of Tests Made Under Sea-Level Conditions (open access)

New Method of Calculating the Power at Altitude of Aircraft Engines Equipped With Superchargers on the Basis of Tests Made Under Sea-Level Conditions

"The present article deals with what is considered to be a simpler and more accurate method of determining, from the results of bench tests under approved rating conditions, the power at altitude of a supercharged aircraft engine, without application of correction formulas. The method of calculating the characteristics at altitude, of supercharged engines, based on the consumption of air, is a more satisfactory and accurate procedure, especially at low boost pressures" (p. 1).
Date: July 1941
Creator: Sarracino, Marcello
Object Type: Report
System: The UNT Digital Library
Ordnance maintenance : prismatic compass, M1918. (open access)

Ordnance maintenance : prismatic compass, M1918.

Describes the Prismatic Compass, M1918 and provides instructions for its operation, maintenance, and its functions in relation to various types of field artillery.
Date: July 17, 1941
Creator: United States. War Department.
Object Type: Book
System: The UNT Digital Library
Orientation (open access)

Orientation

Provides a text and reference book covering the principles of orientation. Orientation is defined as "the accurate location of datum points and the establishment of lines of known length and direction".
Date: July 15, 1941
Creator: United States. War Department.
Object Type: Book
System: The UNT Digital Library
Pressure distribution over an NACA 23012 airfoil with a fixed slot and a slotted flap (open access)

Pressure distribution over an NACA 23012 airfoil with a fixed slot and a slotted flap

Report presents the results of a pressure-distribution investigation conducted in the Langley Memorial Aeronautical Laboratory 7 by 10-foot wind tunnel to determine the air loads on an NACA 23012 airfoil in combination with a fixed leading-edge slot and a slotted flap. Pressures were measured over the upper and lower surfaces of the component parts of the combination for several angles of attack and at several flap settings. The data, presented as pressure diagrams and graphs of section coefficients, are applicable to rib, slat, and flap designs for the combination.
Date: July 30, 1941
Creator: Harris, Thomas A. & Lowry, John G.
Object Type: Report
System: The UNT Digital Library
Radiator design (open access)

Radiator design

From Summary: "A design chart in coefficient form is presented from which a radiator can be chosen with any desired characteristics, whether for minimum power, particular dimensions, or pressure drop for cooling. The chart is a convenient tool for selecting a practicable radiator for any given set of operating conditions. Because the flow is turbulent in the tubes, the chart is for turbulent-flow conditions."
Date: July 1941
Creator: Brevoort, M. J.
Object Type: Report
System: The UNT Digital Library
Report on the Agricultural Experiment Stations, 1940 (open access)

Report on the Agricultural Experiment Stations, 1940

Volume provides a summary of the progress of each agricultural experiment station. Also includes statistics and selected studies.
Date: July 1941
Creator: United States. Office of Experiment Stations.
Object Type: Book
System: The UNT Digital Library
The Tensile Elastic Properties at Low Temperatures of 18:8 Cr-Ni Steel as Affected by Heat Treatment and Slight Plastic Deformation (open access)

The Tensile Elastic Properties at Low Temperatures of 18:8 Cr-Ni Steel as Affected by Heat Treatment and Slight Plastic Deformation

Note presenting the relationship between stress, strain, and permanent set for 18:8 Cr-Ni steel as measured at -110 degrees Fahrenheit. The influence of annealing and slight plastic extension upon the derived elastic properties is also discussed.
Date: July 1941
Creator: Mebs, R. W. & McAdam, D. J., Jr.
Object Type: Report
System: The UNT Digital Library
Texas Attorney General Opinion: O-2992 (open access)

Texas Attorney General Opinion: O-2992

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Will the provisions of House Bill No. 76 in any way affect the amount of penalty to be collected on property reassessed under the provisions of Articles 7346 and 7547?
Date: July 18, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-3003 (open access)

Texas Attorney General Opinion: O-3003

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Gerald Mann, regarding a legal question submitted for clarification: Benefits afforded by Chapter 15, Title 32 of R. C. S. must be specifically adopted.
Date: July 2, 1941
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History