PATENT SPECIFICATION No. 497930.

APPLICATION DATE: May 26, 1936 (USA); May 25, 1937 (UK).

SPECIFICATION ACCEPTED: December 28, 1938.

TITLE: IMPROVED INDICATING INSTRUMENT MORE ESPECIALLY FOR AIRCRAFT.

APPLICANT: CARL JOSEPH CRANE and FRANCIS GLEN NESBITT residing at Paterson 632-B, Fairfield, Ohio, USA.

Size: 195mmx270mm.

No. of pages of text: 7. 

No. of pages of drawings: 2. Size of page of drawing/s: 300mmx225mm. 

Brief Description of Patent:  The present invention relates to aircraft instruments and more particularly to a combined horizontal air speed and vertical air speed (rate of climb) indicator and means for adjusting the indicator for a predetermined condition of flight of an aircraft. 

Condition: Slight crinkling. Wear to edges. 

This was sold by a Library and has their stamp impression on some of the pages/drawings. Multiple Item Postage: Patents can be combined for postage costs, the cost is the same whether you purchase one or several, so check out our Ebay Shop patent listings as well. This patent specification has been disbound from a volume of 100 different patents. This is an original HMSO published item at the time, not a modern copy as are being sold elsewhere. The drawings are often ideal for framing. It is part of a collection of several volumes from the 1893-1900,1907 & 1920/50's that I have from which individual patents will be sold over the next few years.