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

It has some slight water damage on one page

The indicator displays aircraft mach speed from 0

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

These cameras were designed to record results obtained in aerial and ground gunnery training and for producing visual records of aerial combat

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