Construction, Maintenance, and Repairing of Aircraft Instruments JA Gordon
This 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 their customers, finished product manufacturers.
The content of this publication is a reprint from an article in a London journal, which explains why much of the content has a British bent and references the British Royal Air Force and the Air Ministry.
This is a well-preserved document. There is no publication date on the document, but the content pertains to aircraft instruments common in the early 1940's. Measures ~7" x 10".