Report issued by the U.S. Bureau of Mines on the characteristics and behavior of oil and coal distillation processes. The effectiveness of the distillation processes and the properties of the oil and coal mixtures are presented. This report includes tables, graphs, and illustrations.

A concise explanation of the principles to be observed when building chimneys and fireplaces.

Patent for chucks that secure pipes, preventing movement when being cut or threaded, including illustrations.

In order to determine the maximum and the most favorable pitch for a propeller, it was found desirable to investigate the dependence of propeller efficiency on the angle of attack of the propeller blade. The results of a few experiments are given to show that propeller blades conduct themselves just like airplane wings with reference to the dependence of their efficiency on their angle of attack.

The question of ground influence on airplanes has recently attracted some attention in view of the claims made by certain designers that the landing speed of their airplanes is much decreased by an increase in lift coefficient due to the proximity of the ground in landing. The results of wind tunnel tests indicate that ground effect is not entirely beneficial. It decreases the landing speed and cushions the landing shock somewhat. However, it does so at the expense of an increased length of preliminary skimming over the ground.

Report presenting an experiment consisting of an aerofoil and propeller in order to discover the mutual influence between the two components and variations in moment due to the propeller influence.

"The object of this series of experiments was to determine the influence of the relative vertical position of wing and fuselage on the efficiency of the wing. Since the longitudinal position of the wing can be varied but slightly with reference to the center of gravity in a normal airplane, it was kept constant in the experiments to be described and only the vertical position of the wing with reference to the fuselage was varied" (p. 1).

An instrument is described which will illustrate completely in a qualitative sense the longitudinal stability characteristics of an airplane. The instrument is primarily of use for the lecture room, but it is hoped that ultimately it will be possible to obtain quantitative results from it.

This document reports the economic geology of the Lacasa area, Ranger district in North-Central Texas, with fieldwork done in April and May of 1919.

Describes different varieties of Bantam chickens, their characteristics, and recommendations for housing and feeding them.

Patent for a windmill for "connecting or mounting a pump rod and a pitman for transmitting movement from the crank shaft carrying the wheel" (lines 14-16) in a balanced way that will reduce wear and tear. Additionally, other elements attached to the supporting structure will "compensate for the the uneven action due to the variable pull on the pitman and pump rod." (lines 31-33).

Patent for a traction board for placing under automobile wheels when stuck in sand or mud, and hanging device for carrying the boards when not in use.

Patent for a three-piece mold which allows for fan belts to be made using a single piece of rubber or composition material. The fan belts would primarily be used in motor vehicles.

Patent for a road building machine comprised of multiple mechanisms including a blast furnace, mixing chambers, and chemical tanks.

Patent for "new and useful improvements in Hay-Rakes." (line 5-6). "Improved means for governing the dumping movements of the rake." (lines 11-12).

Patent for a convertible automobile body with front seats that can be adjustable horizontally to connect with the rear seats and form a bed.

Patent for concrete building blocks, intended for use in the building of smaller structures, which are strong, easily assembled, and light weight.

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

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.

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 an improved vehicle wheel with a demountable tire rim, so that tires can be easily placed on and taken off the wheel.

Patent for invention that improves fishing. Not only is the tool used for fishing, it can find and remove objects from the water.

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 pipe tongs, adapted to securely grip and rotate pipe sections (or other round articles) of different sizes.