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A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement.It is equal to 1 / 36 yard or 1 / 12 of a foot.
The 38.1 cm/45 Model 1926 naval gun, also known as the Vickers-Armstrong 38.1 centimetres (15.0 in) Mark B, was originally intended to form the armament of the Brazilian battleship Riachuelo. Eighteen of the guns were subsequently purchased by Spain for use as coastal artillery.
palme – Palm, for circumference, 8.86 cm; kvarter – Quarter, 1 ⁄ 4 alen; fod – Defined as a Rheinfuss 31.407 cm from 1683, before that 31.41 cm with variations. alen – Forearm, 2 fod; mil – Danish mile. Towards the end of the 17th century, Ole Rømer connected the mile to the circumference of the earth, and defined it as 12000 alen.
The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I.It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun.
18.75 inches (476.2 mm) Elevation • -15°/+85° Maximum elevation rate: 25°/sec: Traverse • 150° from either side of centerline Maximum traversing rate: 40°/sec: Rate of fire: As built/designed: 40 rounds per minute automatic Down-rated to 28 rounds per minute in 1968: Muzzle velocity: 2,650 ft/s (807.7 m/s) Maximum firing range
The Germans designated captured British guns as 11.4 cm leFH 361(e) and Russian guns as 11.5 cm leFH 362(r). [ 16 ] [ page needed ] 4.5-inch howitzers equipped British and Australian batteries in the Western Desert in 1940 and 1941 , and Australian units in Syria . [ 17 ]
The 10 in (25 cm) gun was a standard "Woolwich" design (characterised by having a steel A tube with relatively few broad, rounded and shallow rifling grooves) developed in 1868, based on the successful Mk III 9 in (23 cm) gun, itself based on the "Fraser" system.
The 22nd (Derajat) Indian Frontier Force mountain battery arrived in the East Africa campaign on 18 December 1916, when they relieved the 28th Battery which returned to India. [4] They appear to have re-equipped from the 10-pounder mountain gun to the 3.7-inch howitzer while in East Africa, and first used the new weapon in action in an attack ...