Memorandum presenting a description of the hydrodynamic lift theory of supporting services. This report is mainly about the task of finding suitable wing sections for given lift conditions. Formulas are given for lift magnitude and moment, which make it possible to obtain solutions of great simplicity and clearness.

It is extremely important in building aircraft engines to determine the requisite cylinder dimensions as accurately as possible, in order that the weight required for a given power shall not be excessive. This report presents a calculation method that depends on the air requirement of the fuel.

Memorandum presenting a glossary of terms used to describe flying boat hulls and the elements used in construction.

Report describing a competition for safety fuel tanks, including the prizes, requirements that must be fulfilled, some other characteristics, tests, and regulations.

Essential principles for building small diesel engines and also structural details so far as feasibility are presented.

The mechanism here described belongs to the class of dynamometer brake in which the motive power is transformed into heat in the brake itself. This mechanism was invented by the writer for the purpose of measuring forces in which the two factors, torque and speed, vary within broad limits, the mechanism itself being of simple construction and of still simpler operation.

Given here are the results of a test conducted in a wind tunnel on the performance of a vane-driven gear pump used to pump gasoline upward into a small tank located within the upper wing from which it flows by gravity to the engine carburetor. Information is given on the efficiency of the pump, the head resistance of the vanes, the performance and characteristics of the unit with and without housing about the vanes, the pump performance when motor driven, and resistance and power characteristics.

This investigation was carried out by request of the United States Air Service at the Massachusetts Institute of Technology wind tunnel in 1918. As the data collected may be of general interest, they are published here by the National Advisory Committee for Aeronautics. The lift, drag, and center of pressure travel are determined for a biplane with a stagger varying from +100% to -100%. It is found that the efficiency and the maximum lift increase with positive stagger.

Report on recovering unburned fuel from boiler furnace refuse, based on processes used in Europe and tests in the United States.

Patent for a carburetor. This carburetor is designed to be used with crude oil, and to be easily constructed and operated.

Report details the characteristics and advantages of the swift traffic airplane constructed by Zeppelin Works at Staaken. The maximum speed, weight, construction, layout, and landing capabilities of the plane are included.

Patent for a new and useful improvements to a blade holder. It can hold any form of razor blades can be securely held and easily released. The holder allows blades to be inserted safely and then hold blades firmly into place.

Patent for a valve and valve seat made of stainless steel for the purpose of preventing rusting and corrosion.

Patent for a device designed to hold and sustain a string of pipe in an elevated position during the process of unscrewing and separating it into sections, primarily used for drilling operations where pipes are connected and disconnected within a borehole.

Patent for a shipping basket designed to keep contents secure and undamaged.

Patent for a flush valve designed for efficiency.

Patent for an incubator designed to maintain temperature automatically.

Patent for cotton packer designed for use in cotton gins.

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.

Patent for "a table...which is specially adapted for use in serving cold drinks, light lunches and the like to customers seated in an automobile or other similar vehicle" and the table "is adjustable so that it may be accommodated to vehicles of different heights" (lines 11-15, 18-19). It also contains an illustration.

Patent for a meat-cutting machine that employs a powered knife and saw combination for the slicing of meat.

Patent for highway-railroad grade crossing designed to slow the flow of traffic as it crosses an intersecting railway.

Patent for a detachable inside door-lock. This is a simple locking device that can be applied and removed from any type of door. The purpose is to make a room private and burglar proof.

Patent for a signal designed to be carried on the rear end of a motor vehicle for the purpose of indicating whether the vehicle intends to turn to the right or to the left, operated by the driver in advance.