Construction, Maintenance, and Repairing of Aircraft Instruments JA Gordon Beaufort While we don't know the

While we don't know the year of manufacture

This particular model was used in the A6M2 version of the Japanese Navy Figher Zero

and Automatic/Manual switch requires the proper electrical connection to toggle

describing its use

As an offshoot of this equipment Ryan have also developed a helicopter hovering aid (AN/APN-97) which presumably uses Doppler signals to tell the pilot whether or not his machine is stationary above ground or sea

Construction, Maintenance, and Repairing of Aircraft Instruments JA Gordon Beaufort While we don't know theThis 30 page document is a reprint by Henry Paulson & Co. of content of Construction, Maintenance, and Repairing of Aircraft Instruments by J. A. Gordon from London's Horological Journal. The Henry Paulson firm appears to have been engaged in the manufacturing and or marketing of precision instrument tools and equipment. It appears that they also published technical references and catalogs such as this in an effort to expand their service offerings to