Construction, Maintenance, and Repairing of Aircraft Instruments JA Gordon Beaufort Our example is 'experienced' with

Our example is 'experienced' with the patina evidencing its age

describing its use

While we don't know the year of manufacture

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

The indicator displays aircraft mach speed from 0

Construction, Maintenance, and Repairing of Aircraft Instruments JA Gordon Beaufort Our example is 'experienced' withThis 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