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Quarry Accidents in the United States During the Calendar Year 1938

Description: Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Date: 1940
Creator: Adams, William W. & Wrenn, Virginia E.
Item Type: Report

Coal-Mine Accidents in the United States, 1937

Description: Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Date: 1940
Creator: Adams, William W.; Geyer, L. E. & Parry, M. G.
Item Type: Report

Extension of pack method for compressive tests

Description: The pack method for determining compressive stress-strain graphs described in NACA Report No. 649 has been modified to extend it's application to thinner gages and stronger materials. The principal modifications consisted in the provision of additional support against instability cementing the specimens of the pack together with fused shellac and the provision of special clamps to hold the specimens together while the test is in progress. The shellac was found to increase the buckling load of the pack without any appreciable effect on the compressive stress-strain graph of the material. The extended pack method described in this note has made possible the application of stresses in excess of 220 kips per square inch to sheet material having a thickness of only 0.02 inch.
Date: December 1, 1940
Creator: Aitchison, C S
Item Type: Report

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

Description: 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 1, 1940
Creator: Ames, Milton B & Sears, Richard I
Item Type: Report

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

Description: 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 1, 1940
Creator: Ames, Milton B , Jr
Item Type: Report

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

Description: 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 1, 1940
Creator: Ames, Milton B , Jr & Sears, Richard I
Item Type: Report

Farm horseshoeing.

Description: Describes the need for shoeing horses, and the steps that should be taken to successfully shoe horses on the farm.
Date: 1940
Creator: Asmus, Henry, 1873-1939. & Williams, J. O. (John Oscar), 1885-
Item Type: Book

Clothes moths.

Description: Describes the life cycle and characteristics of clothes moths, and methods for their control.
Date: January 1940
Creator: Back, E. A. (Ernest Adna), 1886-
Item Type: Book

Flight investigation of control-stick vibration of the YG-1B autogiro

Description: As a preliminary step in an investigation of control-stick vibration in direct-control autogiros, the periodic variations in the moments transmitted through the control system of a YG-1B autogiro were recorded in flight. The results of the measurements are presented in the form of coefficients of Fourier series expressing the varying part of the lateral and the longitudinal moments acting between rotor and fuselage at the control trunnions. The most important component of the variation in stick force was found to have frequency of three times the rotor speed and an amplitude that rose from negligible values at tip-speed ratio below 0.20 to +/-5.2 pounds longitudinally and +/-3.2 pounds laterally at tip-speed ratios of 0.35. Variations in stick force at all other frequencies were small in comparison with those at three times the rotor speed.
Date: June 1, 1940
Creator: Bailey, F J , Jr
Item Type: Report

Farm inventories.

Description: Describes the various uses of farm inventories; provides instructions for making, using, and caring for a farm property book.
Date: 1940
Creator: Ball, James Stuart, 1872-
Item Type: Book

Growing cucumbers for pickling.

Description: Discusses growing cucumbers for the purpose of pickling, and identifies threats from insects and disease.
Date: 1940
Creator: Beattie, James H. (James Herbert), b. 1882.
Item Type: Book

Rhubarb forcing.

Description: Describes methods of forcing rhubarb, using methods developed in Massachusetts and Michigan.
Date: June 1940
Creator: Beattie, James H. (James Herbert), b. 1882. & Beattie, W. R. (William Renwick), b. 1870.
Item Type: Book

Production of peppers

Description: Describes the characteristics of peppers, lists the different varieties, and the steps necessary to successfully produce quality peppers.
Date: July 1940
Creator: Beattie, James H. (James Herbert), b. 1882; Doolittle, S. P. (Sears Polydore), 1890-1961; Beattie, W. R. (William Renwick), b. 1870 & Magruder, Roy, 1900-
Item Type: Book

Celery growing.

Description: A guide to commercial celery-growing, with brief instructions for growing celery in home gardens. Includes descriptions of celery diseases and insect pests.
Date: 1940
Creator: Beattie, W. R. (William Renwick), b. 1870.
Item Type: Book

Lettuce growing.

Description: A guide to lettuce growing, including soil preparation, planting, cultivation, control of insect pests; also discusses the lettuce market.
Date: October 1940
Creator: Beattie, W. R. (William Renwick), b. 1870.
Item Type: Book

Peanut growing.

Description: Describes the steps farmers should take when growing peanuts, including preparing the soil, planting, cultivating, and harvesting.
Date: 1940
Creator: Beattie, W. R. (William Renwick), b. 1870. & Beattie, James H. (James Herbert), b. 1882.
Item Type: Book

Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel, Special Report

Description: Determinations of boundary-layer transition on the NACA 0012 and 2301 airfoils were made in the 8-foot high-speed wind tunnel over a range of Reynolds Numbers from 1,600,000 to 16,800,000. The results are of particular significance as compared with flight tests and tests in wind tunnels of appreciable turbulence because of the extremely low turbulence in the high-speed tunnel. A comparison of the results obtained on NACA 0012 airfoils of 2-foot and 5-foot chord at the same Reynolds Number permitted an evaluation of the effect of compressibility on transition. The local skin friction along the surface of the NACA 0012 airfoil was measured at a Reynolds Number of 10,000,000. For all the lift coefficient at which tests were made, transition occurred in the region of estimated laminar separation at the low Reynolds Numbers and approach the point of minimum static pressure as a forward limit at the high Reynolds Numbers. The effect of compressibility on transition was slight. None of the usual parameters describing the local conditions in the boundary layer near the transition point served as an index for locating the transition point. As a consequence of the lower turbulence in the 8-foot high-speed tunnel, the transition points occurred consistently farther back along the chord than those measured in the NACA full-scale tunnel. An empirical relation for estimating the location of the transition point for conventional airfoils on the basis of static-pressure distribution and Reynolds Number is presented.
Date: January 1, 1940
Creator: Becker, John V.
Item Type: Report