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The 3.2-inch gun M1897 (81 mm), with its predecessors the M1885 and M1890, was the U.S. Army's first steel, rifled, breech loading field gun.It was the Army's primary field artillery piece in the Spanish–American War, Philippine–American War, and Boxer Rebellion from 1898 to 1902.
The 3-inch mine defense guns were part of a comprehensive plan of new fortifications specified by the Board of Fortifications of 1885. The new forts initially included guns up to 12-inch (305 mm) on disappearing carriages, to conceal the fort from observation from the sea.
In US service the mle 1897 was given the designation 75 mm gun M1897. [3] There were 480 American 75 mm field gun batteries (over 1,900 guns) on the battlefields of France in November 1918. [ 4 ] American industry began building the mle 1897 in the spring of 1918, but only 143 American-built guns had been shipped to France by 11 November 1918 ...
The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).
Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras, a lens of a given focal length gives a narrower field of view in such cameras. Sensor size is often expressed as optical format in inches. Other measures are also used; see table of sensor formats and sizes below.
Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]
The QF 3.7-inch AA was Britain's primary heavy anti-aircraft gun during World War II.It was roughly the equivalent of the German Flak 8.8 cm and American 90 mm, but with a slightly larger calibre of 3.7 inches, approximately 94 mm. Production began in 1937 and it was used throughout World War II in all theatres except the Eastern Front.
The 75 mm gun M1916 was a US Army field artillery piece used during and after World War I. It was used as an anti-aircraft gun as well as a field piece. It originated as the 3-inch gun M1913 , which was soon modified to the 3-inch gun M1916 , which was later altered to the subject weapon.