This Driggs cannon and its accessories are lot #1117 at Morphy’s April 2019 auction:
https://www.forgottenweapons.com/us-navy-driggs-mk-ix-37mm-quickfire-cannon/
Developed between 1883 and 1889 by Lt. William Driggs and Commander (later Admiral) Seaton Schroeder, the Driggs cannon was an improvement on the market-standard Hotchkiss quick-fire cannon of the day. By quick-fire, I am referring to a single-shot cannon that has a recoil mechanism and ejects its empty case automatically, leaving the breech open for rapid reloading and subsequent shot. This was the standard type of naval armament for allowing large vessels to combat small and quick torpedo boats in the late 19th century. The Driggs guns were made in many variations and calibers but limited total quantities until about 1908. This example is a Mk IX type in 37mm, made in 1897.
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