Report presenting a description of the Lioré-Olivier LeO 194 seaplane and a particular series of flights made over several months. Its fuselage is made entirely of wood. It has 6 gasoline tanks each with a capacity of 255 liters. It is a single engine biplane with wings mounted above the body of the seaplane.

The author's first experiments with a glider on flight characteristics demonstrated that an accurate flight-path measurement would enable determination of the polar diagram from a gliding flight. Since then he has endeavored to obtain accurate flight measurements by means of kinetograph (motion-picture camera). Different methods of accomplishing this are presented.

A traditional biplane design allows this craft to function with the speed and maneuverability necessary to perform as a pursuit aircraft while also being able to land on water. It featured retractable landing gear for water landings. It was powered with a 450 HP. Lorraine-Dietrich engine.

From page 1: The purpose of this circular is to show the degree of dependence of the United States upon foreign sources for the manganese required by its industries.

Report containing information regarding "the construction and maintenance of overhead and underground electrical supply and communication lines" (p. ii).

The RO VII is a monoplane with two 230 BMW engines mounted on top of the wing. It seats 4 passengers with room for a pilot and a mechanic in the cockpit. A description of the components, dimensions, performances, drawings, and photographs are provided.

Circular presenting a description of the Heinkel H.E.5 commercial seaplane. Its primary important characteristics are a short start, agreeable flying qualities, and long radius of action. Details of the design and flying characteristics are provided.

A variable flap gear, which would function automatically and require no attention during flight appeared to be an attractive idea even in its early stages of development. The advantages of variable camber are described as well as the designs of these automatic flaps.

The types of corrosion and factors of corrosion of duralumin are investigated. Salt water is the most common of the corroding media with which designers have to contend in using duralumin in aircraft and ships.

Memorandum presenting a description of the Paris Aero Show and some of the aircraft that the author observed there. A specific description of some of the designs is provided, as well as some technical drawings of particular elements of these aircraft.

"In this report tests are described in which the distribution of pressures over models of the wings of the PW-9 Airplane was investigated. The wing models were tested individually and in the biplane combination. The investigation was conducted in the atmospheric wind tunnel of the National Advisory Committee for Aeronautics" (p. 315).

"As part of a general program to study combustion in the engine cylinder and to correlate the phenomena of combustion with the observed performance of actual engines, this paper presents a sketchy outline of what may happen in the engine cylinder during the burning of a charge. It also suggests the type of information needed to supply the details of the picture and points out how combustion time and rate affect the performance of the engine. A theoretical concept of a flame front which is assumed to advance radially from the point of ignition is presented, and calculations based on the area and velocity of this flame and the density of the unburned gases are made to determine the mass rate of combustion" (p. 393).

"This report contains the results of tests made in the National Advisory Committee for Aeronautics variable density wind tunnel on three airplane models supplied by the British Aeronautical Research Committee. These models, the BE-2E with R.A.F. 19 wings, the British Fighter with R.A.F. 15 wings, and the Bristol Fighter with R.A.F. 30 wings, were tested over a wide range in Reynolds numbers in order to supply data desired by the Aeronautical Research Committee for scale effect studies. The maximum lifts obtained in these tests are in excellent agreement with the published results of British tests, both model and full scale" (p. 451).

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

One of the fundamental requirements for requirements for registered or certified cotton seed is that they possess a pedigree of merit which has been passed upon by the State Board of Plant Breeder Examiners.