This report presents the results of an investigation to determine the effect of different supercharger capacities on the performance of an airplane and its engine . The tests were conducted on a DH4-M2 airplane powered with a Liberty 12 engine. In this investigation four supercharger capacities, obtained by driving a roots type supercharger at 1.615, 1.957, 2.4, and 3 time engine speed, were used to maintain sea-level pressure at the carburetor to altitudes of 7,000, 11,500, 17,000, and 22,000 feet, respectively. The performance of the airplane in climb and in level flight was determined for each of the four supercharger drive ratios and for the unsupercharged condition.

"An adjustable blade metal propeller was tested at five different angle settings, forming a series varying in pitch. The propeller was mounted on a VE-7 airplane in the twenty-foot propeller research tunnel of the National Advisory Committee for Aeronautics. The efficiencies were found to be from 4 to 7 per cent higher than those of standard wood propellers operating under the same conditions. The results are given in convenient form for use in selecting propellers for aircraft" (p. 521).

Scientific paper issued by the Bureau of Standards over thermal expansion of fused silica. As stated in the abstract, "this paper gives the results of an investigation on the thermal expansion of transparent and nontransparent fused silica for various temperature ranges between -125 and +1,000 degrees Celsius. A detailed description of the apparatus and the methods used in this research and a summary of available data obtained by previous observers on the thermal expansion of fused silica are given" (p. 1). This paper includes tables, photographs, and illustrations.

Technical paper issued by the Bureau of Standards over studies conducted on fire-clay bricks. The results of the studies are discussed. This paper includes tables, and illustrations.

Patent for improvements in sheet-placing machines for pushing and pulling devices to their correct orientation of oil tanks (lines 10-13) roof construction without the possibility of injury to mechanics.

Patent for an wheeled vehicle mounted insect destroyer that brushes insects from plants and destroys them utilizing flames, includes illustrations.

Report discusses the results of testing on a B.M.W. engine in an altitude chamber where temperature and pressure can be controlled to simulate flight at various altitudes. Results for various engine speeds, altitudes, and propeller speeds are provided.

Patent for an aeroplane that is inexpensive and easily built, while preventing the aeroplane from going into a tailspin.

Patent for multiple innovations to automobile air-brakes and starters, including improvements such as ease of use, reliability, and versatility amongst vehicle models.

Patent for a device to heat a cooking utensil's content. The object provides a device which will support a receptacle in or outside any type of heating medium. It also requires only a minimal heating surface to radiate heat to all sides of the receptacle as well as the very bottom.

This patent focuses on a single-stock plow featuring an innovative attachment designed to enhance stability without requiring material structural changes. The attachment ensures improved steadiness during operation, providing an ease of use comparable to a turning plow

Patent for a power hammer that can utilize any power source and only needs one person to operate it. The design also uses less parts, making it more affordable.

Patent for the process of making bearings, for improvement of bearings and the process of bearing formation on the interior of rotary members (or rotary cutters used on earth boring drills).

Patent for a railroad crossing signal. The device is created so that the highway signal can be automatically raised or lowered at the crossing by a passing train.

Patent for a valve cleaner to remove carbon from the internal combustion motors in automobiles. It can be used without removing the valve or motor.

Patent for a new and useful improvement in weevil exterminators that provides a comparatively simple and effective apparatus for removing boll weevils from cotton plants. It also removes the injured or affect leaves and fruit that have been attacked by the boll weevil so that further injury to the plants may be prevented, and at the same time gather from the ground at the roots of the rows of cotton plants the leaves and rubbish detached from the plants.

Patent for improvements to the elevator controlling device. These improvements have to do with the main circuit being broken while the elevator doors are open, thus stopping the elevator from moving before the doors are fully closed.

Patent for a centrifugal flour sifter that removes pests, mold, and debris.

Patent for a flush valve designed for efficiency.

Patent for a speed transmission device that simply and efficiently changes the gears in an automobile especially at fluctuating speeds.

Patent for a surface-treating machine propelled by a motor. The design is compact, economic, and more efficient than previous machines.

Patent for improvements in parcel carrier for automobiles.

Patent for a safety medicine spoon which can be carried over distance without spillage or loss of the contents held by the spoon, particularly aimed at helping medicate infants or weak patients without the potential for spillage. The design prioritizes easy cleansing and decontamination.

Patent for "the provision of means for removably holding a heel in position for attachment to a shoe...as to hold it against accidental displacement during the operation of securing it to the shoe..." (lines 10-12, 22-24). It also includes an illustration.