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Sweetclover in Corn Belt farming.

Description: Describes the recommended practices for cultivating sweet clover, and suggestions for its use on the farm. Includes outlines of cropping systems used in the Corn Belt.
Date: 1940
Creator: Crosby, M. A.; Kephart, L. W. (Leonard Wheeler), 1892- & Hollowell, E. A. (Eugene Amos)
Item Type: Refine your search to only Book
open access

Tensile Elastic Properties of Typical Stainless Steels and Nonferrous Metals as Affected by Plastic Deformation and by Heat Treatment

Description: A general discussion is given of the relationships between stress, strain, and permanent set. From stress-set curves are derived proof stresses based on five different percentages of permanent set. The influence of prior plastic extension on these values is illustrated and discussed. A discussion is given of the influence of work-hardening, rest interval, and internal stress on the form of the proof stress-extension curve.
Date: February 23, 1940
Creator: McAdam, D. J., Jr. & Mebs, R. W.
Item Type: Refine your search to only Report
open access

Testing of High-Octane Fuels in the Single-Cylinder Airplane Engine

Description: "One of the most important properties of aviation fuels for spark-ignition engines is their knock rating. The CFR engine tests of fuels of 87 octane and above does not always correspond entirely to the actual behavior of these fuels in the airplane engine. A method is therefore developed which, in contrast to the octane number determination, permits a testing of the fuel under various temperatures and fuel mixture conditions. The following reference fuels were employed: 1) Primary fuels; isooct… more
Date: February 1940
Creator: Seeber, Fritz
Item Type: Refine your search to only Report
open access

Tests of a gust-alleviating flap in the gust tunnel

Description: "Tests were made to determine the effectiveness of a long-period dynamically overbalanced flap in reducing airplane accelerations due to atmospheric gusts. For two gust shapes, one gust velocity, one forward velocity, and one wing loading, a series of flights was made with the flap locked and was then repeated with the flap free to operate. The records were evaluated by routine methods. The results indicate that the flap reduced the maximum acceleration increment 39 percent for a severe gust bu… more
Date: January 1940
Creator: Donely, Philip & Shufflebarger, C. C.
Item Type: Refine your search to only Report
open access

Tests of Lead-Bronze Bearings in the DVL Bearing-Testing Machine

Description: "The lead-bronze bearings tested in the DVL machine have proven themselves very sensitive to load changes as in comparison with bearings of light metal. In order to prevent surface injuries and consequently running interruptions, the increase of the load has to be made in small steps with sufficient run-in time between steps. The absence of lead in the running surface, impurities in the alloy (especially iron) and surface irregularities (pores) decreases the load-carrying capacity of the bearin… more
Date: June 1940
Creator: Fischer, G.
Item Type: Refine your search to only Report
open access

A theoretical study of lateral stability with an automatic pilot

Description: "The influence of automatic operation of the aileron and rudder controls on the lateral stability of an airplane is discussed. The control deflections are assumed to be proportional to the deviations and to the rates of deviation of the airplane from steady-flight conditions. The effects of changes in the types of deviation governing control application are considered. For one simple method of control in which the aileron deflection is proportional to the angle of bank and the rudder deflection… more
Date: March 4, 1940
Creator: Imlay, Frederick H.
Item Type: Refine your search to only Report
open access

The Torsion of Box Beams With One Side Lacking

Description: "The torsion of box beams of rectangular section, the edges of which are strengthened by flanges, and of which one side is lacking, is analyzed by the energy method. The torsional stresses are generally taken up by the bending of the two parallel walls, the rigidity of which is augmented by the third wall. The result was checked experimentally on duralumin and plywood boxes. The torsion recorded was 10 to 30 percent less than that given by the calculation, owing to self-stiffening" (p. 1).
Date: April 1940
Creator: Cambilargiu, E.
Item Type: Refine your search to only Report
open access

Transient effects of the wing wake on the horizontal tail

Description: "An investigation was made of the effect of the wing wake on the lift of the horizontal tail surfaces. In the development of expressions for this effect, the growth of wing circulation and wing wake, the time interval represented by the tail length, and the development of lift by the rail were considered. The theory has been applied to a specific case to show the magnitude of the effect to be expected. It is shown that, for motions below a certain frequency, the development of lift by the tail … more
Date: August 1940
Creator: Jones, Robert T. & Fehlner, Leo F.
Item Type: Refine your search to only Report
open access

Variation in Velocity Profile with Change in Surface Roughness of Boundary

Description: "The present report deals with the variation of a turbulent velocity profile in flow from rough to smooth wall and vice versa. Expressions obtained for the shear-stress distribution with respect to the distance from the point of junction of the different roughnesses and from the wall distance, are utilized to ascertain the developing velocity distributions. Under simplified assumptions, the use of these formulas renders possible the integration of the motion equations for the shear stress. This… more
Date: September 1940
Creator: Jacobs, W.
Item Type: Refine your search to only Report
open access

The Wheat Jointworm and Its Control

Description: Revised edition. "The wheat jointworm is a very small grub which lives in stems of wheat, feeding on the juices of the plant and causing a slight swelling or distortion of the stem above the joint. The egg from which it hatches is laid in the stem by an insect resembling a small black ant with wings. This insect attacks wheat only. The injury which it causes to wheat is very distinct from that caused by the Hessian fly, yet the effects caused by these two insects are often confused by farmers."… more
Date: 1940
Creator: Phillips, W. J. (William Jeter), 1879-1972 & Poos, F. W.
Item Type: Refine your search to only Pamphlet
open access

Why potatoes run out.

Description: Describes the types of diseases attacking potatoes, how to identify them, and how to treat the plants and seed potatoes in order to prevent the spread of disease.
Date: 1940
Creator: Schultz, E. S. (Eugene S.), 1884-
Item Type: Refine your search to only Book
open access

Wind-tunnel investigation of air inlet and outlet openings on a streamline body

Description: In connection with the general problem of providing air flow to an aircraft power plant located within a fuselage, an investigation was conducted in the Langley 8-foot high-speed tunnel to determine the effect on external drag and pressure distribution of air inlet openings located at the nose of a streamline body. Air outlet openings located at the tail and at the 21-percent and 63-percent stations of the body were also investigated. Boundary layer transition measurements were made and correla… more
Date: September 11, 1940
Creator: Becker, John V.
Item Type: Refine your search to only Report
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