States

The Ryegrasses. (open access)

The Ryegrasses.

Describes different kinds of ryegrass, the best climate and soil for its growth, and the steps a farmer should take for successful hay and pasture growth.
Date: May 1940
Creator: Schoth, H. A. (Harry August), b. 1891 & Hein, M. A. (Mason August), b. 1894
Object Type: Book
System: The UNT Digital Library
Pressure-distribution investigation on an NACA 0009 airfoil with a 30-percent-chord plain flap and three tabs (open access)

Pressure-distribution investigation on an NACA 0009 airfoil with a 30-percent-chord plain flap and three tabs

From Summary: "Pressure-distribution tests of an NACA 0009 airfoil with a 30-percent-chord plain flap and three plain tabs, having chords 10, 20, and 30 percent of the flap chord, were made. The purpose of these tests was to continue an investigation to supply structural and aerodynamic section data that may be applied to the design of horizontal and vertical tail surfaces. The results are presented as diagrams of resultant pressures and of resultant-pressure increments for the airfoil with the flap and the 20-percent-chord tab. Increments of normal-force and hinge-moment coefficients for the airfoil, the flap, and the three tabs are also given. At all unstalled flap and tab deflections, the experimental distributions agree well with those calculated by an analytical method. The agreement is poor, however, then the stalled or the unstalled condition of the flap or tab deflected alone was changed to an unstalled or stalled condition by the simultaneous deflection of both the flap and the tab."
Date: May 1940
Creator: Ames, Milton B., Jr. & Sears, Richard I.
Object Type: Report
System: The UNT Digital Library
Pressure-distribution investigation of an NACA 0009 airfoil with an 80-percent-chord plain flap and three tabs (open access)

Pressure-distribution investigation of an NACA 0009 airfoil with an 80-percent-chord plain flap and three tabs

Pressure-distribution tests of an NACA 0009 airfoil with an 80-percent-chord plain flap and three plain tabs, having chord of 10, 20, and 30 percent of the flap chord, were made. Section data suitable for application to the design of horizontal and vertical tail surfaces were obtained. Resultant-pressure diagrams for the airfoil with the flap and the 20-percent-chord tab are presented. Plots are also given of increments of normal-force and hinge-moment coefficients for the airfoil, the flap, and the three tabs. A comparison of some characteristic slopes for the 30-, the 50-, and the 80-percent-chord flaps, tested in the general investigation of plain flaps for control surfaces, is included. Section aerodynamic and load data have been made available for a wide range of flap and a tab chords to be used on an NACA 0009 airfoil or on other conventional sections.
Date: May 1940
Creator: Ames, Milton B., Jr. & Sears, Richard I.
Object Type: Report
System: The UNT Digital Library
The Flow of a Compressible Fluid Past a Sphere (open access)

The Flow of a Compressible Fluid Past a Sphere

"The flow of a compressible fluid past a sphere fixed in a uniform stream is calculated to the third order of approximation by means of the Janzen-Rayleigh method. The velocity and the pressure distribution over the surface of the sphere are computed and the terms involving the fourth power of the Mach number, neglected in Rayleigh's calculation, are shown to be of considerable importance as the local velocity of sound is approached on the sphere. The critical Mach number, that is, the value of the Mach number at which the maximum velocity of the fluid past the sphere is just equal to the local velocity of sound, is calculated for both the second and the third approximation and is found to be, respectively, Mcr=0.587 and Mcr=0.573" (p. 1).
Date: May 1940
Creator: Kaplan, Carl
Object Type: Report
System: The UNT Digital Library
Wind-tunnel investigation of two airfoils with 25-percent-chord Gwinn and plain flaps (open access)

Wind-tunnel investigation of two airfoils with 25-percent-chord Gwinn and plain flaps

Aerodynamic force tests of an NACA 23018 airfoil with a Gwinn flap having a chord 25 percent of the overall chord and of an NACA 23015 airfoil with a plain flap having a 25-percent chord were conducted to determine the relative merits of the Gwinn and the plain flaps. The tests indicated that, based on speed-range ratios, the plain flap was more effective than the Gwinn flap. At small flap deflections, the plain flap had lower drag coefficients at lift-coefficient values less than 0.70. For lift coefficients greater than 0.70, however, the Gwinn flap at all downward flap deflections had the lower drag coefficients.
Date: May 1940
Creator: Ames, Milton B., Jr.
Object Type: Report
System: The UNT Digital Library
Consideration of Auxiliary Jet Propulsion for Assisting Take-Off (open access)

Consideration of Auxiliary Jet Propulsion for Assisting Take-Off

Report presenting an analysis and simple method to help solve the problem of assisting the take-off of an airplane by means of auxiliary jet propulsion by determining the jet thrust and weight of jet fuel required to provide a desired reduction in take-off distance or increase in pay load or fuel load for a fixed take-off distance. The use of previous experimental work to verify the analysis is also provided.
Date: May 1940
Creator: Turner, L. Richard
Object Type: Report
System: The UNT Digital Library
On the Theory of Unsteady Planing and the Motion of a Wing With Vortex Separation (open access)

On the Theory of Unsteady Planing and the Motion of a Wing With Vortex Separation

The disturbance imparted to water by a planing body give rise to a wave form of motion on the free surface, the length of the waves increasing indefinitely with increase in the Froude number and being directly proportional to the latter in the case of the plane or two-dimensional problem. At large Froude numbers the effect of the weight shows up to any appreciable extent only at some distance from the body, so that the flow near the body can be considered as part of a flow of an infinitely extending weightless fluid. This paper is a consideration of these characteristics as well as a formulation of the planing problem and its relation to the problem of a thin wing.
Date: May 1940
Creator: Sedov, L.
Object Type: Report
System: The UNT Digital Library
Some Data on the Static Longitudinal Stability and Control of Airplanes: Design of Control Surfaces (open access)

Some Data on the Static Longitudinal Stability and Control of Airplanes: Design of Control Surfaces

In the solution of a number of problems on the stability and controllability of airplanes, there arises the necessity for knowing the characteristics of the tail surfaces of the types in common use today. Of those characteristics, the most important are the effectiveness and hinge moments of the tail surfaces. As has been shown in the present paper, there exists the possibility of determining these characteristics by the formulas obtained with a degree of accuracy sufficient for the purposes of preliminary computation.
Date: May 1940
Creator: Martinov, A. & Kolosov, E.
Object Type: Report
System: The UNT Digital Library
Comparison of Three Exit-Area Control Devices on an N.A.C.A. Cowling, Special Report (open access)

Comparison of Three Exit-Area Control Devices on an N.A.C.A. Cowling, Special Report

"Adjustable cowling flaps, an adjustable-length cowling skirt, and a bottom opening with adjustable flap were tested as means of controlling the rate of cooling-air flow through an air-cooled radial-engine cowling. The devices were tested in the NACA 20-foot tunnel on a model wing-nacelle-propeller combination, through an airspeed range of 20 to 80 miles per hour, and with the propeller blade angle set 23 degrees at 0.75 of the tip radius. The resistance of the engine to air flow through the cowling was simulated by a perforated plate" (p. 1).
Date: May 1940
Creator: McHugh, James G.
Object Type: Report
System: The UNT Digital Library
Pressure available for cooling with cowling flaps (open access)

Pressure available for cooling with cowling flaps

Report presents the results of a full-scale investigation conducted in the NACA 20-foot tunnel to determine the pressure difference available for cooling with cowling flaps. The flaps were applied to an exit slot of smooth contour at 0 degree flap angle. Flap angles of 0 degree, 15 degrees, and 30 degrees were tested. Two propellers were used; propeller c which has conventional round blade shanks and propeller f which has airfoil sections extending closer to the hub. The pressure available for cooling is shown to be a direct function of the thrust disk-loading coefficient of the propeller.
Date: May 9, 1940
Creator: Stickle, George W.; Naiman, Irven & Crigler, John L.
Object Type: Report
System: The UNT Digital Library
Pressure distribution over NACA 23012 airfoil with a slotted and a split flap (open access)

Pressure distribution over NACA 23012 airfoil with a slotted and a split flap

A pressure-distribution investigation has been conducted in the NACA 4 by 6-foot vertical wind tunnel to determine the air loads on an NACA 23012 airfoil in combination with a 25.66-percent-chord slotted flap and a 20-percent-chord split flap. Pressures were measured on both the upper and the lower surfaces of the main airfoil and the flaps for several angles of attack and at several flap settings. The data, presented as pressure diagrams and as graphs of the section coefficients for the flap alone and for the airfoil-flap combinations, are applicable to rib and flap design for a combination of a thick airfoil and a slotted or a split flap. The results of previous tests of a NACA 23012 airfoil with a slotted flap are compared with the present results.
Date: May 28, 1940
Creator: Harris, Thomas A. & Lowry, John G.
Object Type: Report
System: The UNT Digital Library
Texas Attorney General Opinion: O-1335A (open access)

Texas Attorney General Opinion: O-1335A

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: Payment of costs in connection with the prosecution of offenses under Art. 567 b., Vernon's Penal Code (Reconsideration).
Date: May 9, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-1889 (open access)

Texas Attorney General Opinion: O-1889

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: Construction of Article 4727, Revised Civil Statutes of Texas, 1925, and Article 577, Penal Code of Texas, 1925.
Date: May 16, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2008 (open access)

Texas Attorney General Opinion: O-2008

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: Where one person operates a store and another person owns title to the merchandise in the store, the operator is liable for the chain store tax.
Date: May 1, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2081 (open access)

Texas Attorney General Opinion: O-2081

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: Does the corporation in question operate “stores” or “bona fide distributing points” within the meaning of the Texas Chain Store Tax Act?
Date: May 29, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2086 (open access)

Texas Attorney General Opinion: O-2086

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: Necessity of lis pendens notice in ad valorem tax suits.
Date: May 2, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2089 (open access)

Texas Attorney General Opinion: O-2089

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: (1) Validity of Order of commissioners’ court levying annual occupation tax upon all occupations permitted to be taxes by Article 7047, V.A.C.S., for the year 1938 and succeeding years to remain in force until repealed or changed by order of said court. (2) Is Article 121, Penal Code of Texas, void and unenforceable because of its uncertainty and indefiniteness in fixing penalty for violation thereof.
Date: May 5, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2125 (open access)

Texas Attorney General Opinion: O-2125

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: Is it the duty of the state and county tax assessor-collector to assess and collect city government taxes of the City of Court Lake and related questions
Date: May 3, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: O-2126 (open access)

Texas Attorney General Opinion: O-2126

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: Qualifications of voters in bond elections.
Date: May 21, 1940
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Business Review, Volume 14, Issue 4, May 1940 (open access)

Texas Business Review, Volume 14, Issue 4, May 1940

Newsletter of the University of Texas Bureau of Business Research outlining statistics and research related to business in Texas.
Date: May 28, 1940
Creator: University of Texas. Bureau of Business Research.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Monthly Report of the Attorney General of the State of Texas, Volume 2, Number 4, April 1940 (open access)

Monthly Report of the Attorney General of the State of Texas, Volume 2, Number 4, April 1940

Monthly report documenting orders, opinions, and other legal statements issued by the Office of the Attorney General in Texas.
Date: May 1940
Creator: Texas. Attorney-General's Office.
Object Type: Report
System: The Portal to Texas History