The National Bureau of Standards tested a 300-horsepower Hispano-Suiza engine to determine the characteristic performance of the engine at various altitudes. The engine was operated at the ground, at 25,000 feet, and at intermediate altitudes, both at full loads similar to those that would be imposed upon the engine at various speeds by a propeller whose normal full-load speed was 1,800 r.p.m. Friction horsepower also was determined in order that the mechanical efficiency of the engine might be calculated.

Patent for improvements in attachments to lister-cultivators. Illustration is included.

Patent for improvements to battery terminal fastening devices. Illustration is included.

Patent for new and useful improvements in irrigation apparatuses. The design includes "a system of surface irrigation comprising a main supply tank, a series of reservoirs, pipes connecting said tank and reservoirs" (lines 95-98). It is intended to allow for irrigating large and small plats of land simply and efficiently.

Patent for new format of bank checks in order to deter fraud.

Patent for an ice carrier for automobiles. Illustration is included.

Patent for vehicle, that when stopped, can be turned into a store which customers enter through one end and exit the other.

Patent for improving riveting machines "used in the manufacture of leather and similar goods" (lines 12-13) such that "during the riveting operation the end of the rivet is spun and cut off to hold the bur or washer to its work" (lines 16-19).

Patent for a device capable of removing sheen and unsightly stains from clothes, such as garments and coats, to restore them to their original appearance.