In Partnership With

July 1, 1919

Wireless Telegraphy Applied to Aviation

Lighter-than-Air Craft

The New Navy General Specification for Airplanes

572573

Wireless Telegraphy Applied to Aviation

In the present article the fundamental principles of wireless transmission will be stated in a simple elementary form, and the application of this invention to air navigation will be particularly considered with special reference to its use for communication between airplanes and radio stations on the ground.

584585

Lighter-than-Air Craft

The fabrics used in airships are of three main types:— 1. Gastight fabric, such as that used for gas bags of a rigid ship. 2. Outer eover fabric, of which the principal function is to form a rain and weather proof outer cover to the ship, both as a fairing to reduce her resistance and to protect her internal bags from variations of temperature, due to radiant heat, and from deterioration caused by sunlight.

592593

The New Navy General Specification for Airplanes

The new edition of the Navy General Specification for Airplanes (No. 100-A), just issued, has been very completely revised and expanded to some 42 pages, including the index. This new edition is divided into five distinct sections (each covering a different phase), an appendix and a detailed index.

580581

Course in Aerodynamics and Airplane Design

Section 6. Instruments for Full Flight Testing

576577

The Value of Supercharging

The following report is based upon a test made in the altitude laboratory of the Bureau of Standards to determine the effect produced upon the horsepower output of an airplane engine by the introduction of air to the carbureter at a higher pressure than the exhaust or back pressure.
576577

Bids and Specifications of Mailplanes

The accompanying table gives detailed specifications of the mailplanes bidded for by various manufacturers at the call of the Post Offiee Department. The widest latitude in construction and design was allowed in the specifications for tenders in order to get the type of airplane required for mail carrying but it was demanded that the machines should be able to carry not less than 1,500 lb., and if possible 1½ tons, of mail, have a cruising speed of from 90 to 100 m.p.h., a high speed of from 110 to 115 m.p.h., a cruising radius of 6 hr., and a service ceiling of 15,000 ft.
590591

Meteorology and Aeronautics

594595

Desirable Developments

580581

Vickers Vimy-Rolls Crosses the Atlantic

The Vickers airplane entered for the trans-Atlantic flight competition of the London Daily Mail, Capt. Jack Alcock, pilot, and Lieut. Arthur W. Brown, navigator, succeeded on June 14-15 in making the first non-stop flight across the Atlantic covering the distance of 1936 land miles from St. John’s, N. F. to Clifden, Ireland, in 15 hr. 57 min.
570571

Editorials

Editorials

June 151919 July 151919