An instantaneous direct-reading radiogoniometer

A paper co-written by Robert Watson-Watt which describes radio direction finding apparatus.

Date: Published in 1926
Publication: Journal of the Institution of Electrical Engineers, Volume 64, Pages 611-622.

This article is an example of Robert Watson-Watt's work as a radio researcher while at the Radio Research Board.

It describes a radio direction finding apparatus - a radiogoniometer - devised by Watson-Watt and J F Herd and marks an important development in radio technology.

This article builds on previous research by Watson-Watt, Herd and Appleton when the 'squegger' - a type of transformer - was patented. The paper describes the device, which consists of a combination of directional aerials with a cathode ray oscillograph. The oscillograph measures alternating or varying electric current and voltage.

The authors describe a typical installation, and suggest a possible solution to the problem of navigational beacons.

The article ends with a discussion before the Wireless Section on March 3, 1926, where Watson-Watt and Herd answer various questions. Those attending included the Admiral of the Fleet Sir Henry Jackson, Dr G C Simpson and Squadron Leader E L Johnston.

Among charts and diagrams are used to illustrate the article are:

- General arrangement of cathode-ray direction finder

- Details of circuits

- Azimuthal distribution of atmospherics and thunderstorms on the 10 May 1925.

- Azimuthal distribution of atmospherics on 13 and 14 May 1925.