It is sufficient to consider only the equations of motion of the towed body whereas those of the cable may be left out of consideration. The result obtained makes it possible to determine which factors affect the critical velocity and what modifications of the instrument are necessary for extending the upper limit of that velocity.

Circular presenting a description of the Hanriot-Biche 110 C1 airplane, which is a French all-metal low-wing pursuit monoplane. Details regarding the wing, girders and tail surfaces, pilot's cockpit, power plant, landing gear, flying qualities, and photographs are provided.

Circular presenting a description of the Comte A.C. 3, which is a high-wing monoplane with tow tandem 600 hp Hispano-Suiza engines mounted above the fuselage. Details of the design, fuel tanks, fuselage, pilot seating, engine, wings, safety factors, and flight qualities are provided.

Circular presenting a description of the Bernard 80 aircraft. Details are provided on the body shape, wings, ribs, fuel requirements, and flight characteristics.

Circular describing the Comper Streak single-seat low-wing cantilever monoplane. Details of the fuselage, construction, wing, stabilizer, engine, landing gear, characteristics, drawings, and photographs are provided.

Circular presenting a description of the Farman night bombers 211 and 212, which are four-engine high-wing monoplanes that are equipped with different engines. Details of the wing structure, fuselage, tail surface and controls, landing gear, power plant, characteristics, performance, drawings, and photographs are provided.

This report will present ideas closely related to the vortex conception and illustrate them in the simplest possible terms. In addition to these general considerations, this report will attempt to show the application of the vortex theory in connection with the wing theory.

Memorandum presenting an investigation to determine the variations in the velocity of the air when it was obliged to flow about a wing profile. Special interest was paid to the determination of velocity as compared with that of the undisturbed flow and of the velocity drop in successive planes perpendicular to the flow direction at increasing distances from the wing profile.

Results of an investigation wherein the change of the normal force coefficient with Reynolds Number was obtained statically for a 15.5-centimeter hemispherical cup.

Describes the types of machinery which can be used for dusting cotton plants with chemicals to prevent boll weevil damage.

Circular presenting a description of the Caproni 90 P.B., which is the largest airplane in existence at the time of the report. Details of the weight, construction, wings, controls, fuselage, tail, landing gear, flying qualities, and photographs are provided.

Circular presenting a description of the Mono-Spar light airplane, which is a small twin-engined low-wing cabin monoplane. A description of the design, structural features, characteristics, flying qualities, photographs, and drawings are provided.

"This thesis presents the method of moment distribution modified to include the effect of axial load upon the bending moments. This modification makes it possible to analyze accurately complex structures, such as rigid fuselage trusses, that heretofore had to be analyzed by approximate formulas and empirical rules. The method is simple enough to be practicable even for complex structures, and it gives a means of analysis for continuous beams that is simpler than the extended three-moment equation now in common use" (p. 1).

Circular describing the Avro Commodore, which is a cabin biplane of metal construction that is designed for comfort rather than performance. Details regarding the fuselage, wings, landing gear, controls, characteristics, drawings, and photographs are provided.

Discusses garlic as a crop in terms of its different varieties, the steps for preparing land, cultivating, harvesting, cleaning, and shipping garlic for the market.

Describes the growth of strawberry clover in fields, its benefits and tolerance, and steps for planting, cultivating, and seed production.

Report issued by the U.S. Bureau of Mines on studies of the known natural gas reserves in central Michigan sandstone deposits. The geology and methods used to estimate the reserves are presented. This report includes tables, illustrations, and maps.

Report issued by the U.S. Bureau of Mines on the oil and gas production of the Eunice oil field in southeastern New Mexico. Properties of the oil field, and analysis of the oil and gas produced are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines on the leaching of copper ores. The different strengths and cycles of solvents to extract impurities from the ore are presented. This report includes tables and graphs.

Report issued by the U.S. Bureau of Mines on the coal mine related deaths that occurred during the month of June, 1931. The number of fatalities and the causes of each are presented. This report includes tables and a graph.

Describes types of erosion and methods for preventing the erosion of soil by water and wind.

Describes the steps taken to build and set traps for coyotes and wolves in the United States.

Describes the lungworm parasite infested in swine, and methods for its control.

Volume provides a summary of the progress of each agricultural experiment station. Also includes statistics, a bibliography of experiment station publications, and selected studies.