(Bradley, E.P. Major, editor) Bureau of Aircraft Production, Air Service U.S. Army. Handbook of Aircraft Armament. GPO, Washington D.C., 1910. 96 pages, 6x8.5", photo illus, hardcover with brass posts, large color foldout of the Lewis gun (shown partially in the last photo below) and two smaller foldouts of the machine gun synchronizing gear. Ten sections as follows: Machine Guns, Machine gun mounts, Synchronizing gears, Machine gun sights, Bombs, Bomb release mechanism, Theory of bomb sighting, Aircraft ammunition, Pyrotechnics and Small arms. Cover and title page marked "Confidential".
Absolutely the rarest of the WWI manuals!!! I have owned only three in 50 years; one sold about a year ago and one in my collection...now this one. Very good original condition; no flaws.
(Note: I published a small edition (25) of a facsimile of this manual, all serial numbered. It is for sale on this website with stock number 16-PILOT-00002 at a reasonable price)