It is argued that there should be an agreement as to what conventions to use in determining absolute coefficients used in aeronautics and in how to plot those coefficients. Of particular importance are the absolute coefficients of lift and drag. The author argues for the use of the German method over the kind in common use in the United States and England, and for the Continental over the usual American and British method of graphically representing the characteristics of an airfoil.

This report presents a description of the design of the Cuatro Vientes wind tunnel.

Note presenting a number of instruments that can assist pilots with observing the position of the airplane. Some of the instruments include an inclinometer with stationary system of reference and an inclinometer with moving axes.

"The question of behavior of a streamlined body with round or square cross-sections is of importance in determining the shape to give an airplane fuselage. It is our task here to show how the lift and drag are affected, with the object placed obliquely to the air stream" (p. 1).

We are undertaking the task of computing the air forces on a slightly cambered airfoil in the absence of friction and with an infinite aspect ratio. We also assume in advance that the leading edge is very sharp and that its tangent lies in the direction of motion.

The authors argue that the center of gravity has a preponderating influence on the longitudinal stability of an airplane in flight, but that manufacturers, although aware of this influence, are still content to apply empirical rules to the balancing of their airplanes instead of conducting wind tunnel tests. The author examines the following points: 1) longitudinal stability, in flight, of a glider with coinciding centers; 2) the influence exercised on the stability of flight by the position of the axis of thrust with respect to the center of gravity and the whole of the glider; 3) the stability on the ground before taking off, and the influence of the position of the landing gear. 4) the influence of the elements of the glider on the balance, the possibility of sometimes correcting defective balance, and the valuable information given on this point by wind tunnel tests; 5) and a brief examination of the equilibrium of power in horizontal flight, where the conditions of stability peculiar to this kind of flight are added to previously existing conditions of the stability of the glider, and interfere in fixing the safety limits of certain evolutions.

The Albatros 72A is a normal tractor biplane specifically designed to deliver newspapers by dropping them overboard in bundles for ground transport to pick up. It has a 42 ft. wingspan, and a 220 HP B.M.W. engine.

Annual report submitted by the Boy Scouts of America to Congress describing highlights from 1926, activities, finance, organizational leadership, and other information about scouting programs.

Report presenting an explanation of the Flettner wind-driven rotor ship and how it functions using the "Magnus effect". The advantages of the construction of this type of ship and the development of flow around the cylinder used to power it are described.

Patent for an attaching ring to connect a boiler to a water heater jacket that is described in pending application Serial No. 304,041.

Patent for a lock designed to attach to the spokes of a steering wheel with the intention of guarding it from "unauthorized persons" (line 20), including illustrations.

Patent for devices that thickens slimes for ore milling operations in which it will indicate the density and regulate it so it will not go below a predetermined value.

Patent for improvements in automobile radiators to provide the ability to remove the top and the bottom of the tanks so they can be easily reached for replacement and repair.

Patent for an automobile theft preventing device which prevents the operation of the automobile by an unauthorized person and prevents the theft of thereof and can be controlled by the owner/authorized person permitting the operation of the automobile.

Patent for a frame that can support a baby net and can be collapsed for easy storage. The frame also features components that prevent collapse and provide stability when in use.

Brief summary of the geographic distribution, habits, and habitats of the birds, mammals, insects, arachnids, and chilopods of the Pribilof Islands.

The Bluebird is a two seat, side by side biplane, designed primarily for training and pleasure flying. A description of the construction and flight characteristics is provided.

Patent for a machine that catches insects and their eggs by using beaters and a catch pan as the machine is drawn over crops. The parts are adjustable to adapt to the size of crop rows and crops.

Describes the characteristics of the boll weevil, the damage it causes to cotton crops of the southeastern United States, and methods of control.

Patent for an inexpensive, efficient boring and threading tool that "will enable a smooth and even surface to be produced with a minimum of skill on the part of the operator" (lines 18-21).

Patent for an improvement on agricultural brackets that allow for easier and more secure connection and support to a variety of agricultural implements.

Patent for '' bridge improvements, especially for placement over gutters, ditches, and alike ''

Patent for a broom that has replaceable straw sections.

Patent for improvements in burners to allow them to use liquid fuel such as oil.