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The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...
In the metric system, the mass per unit area of all types of textiles is expressed in grams per square metre (g/m 2). The gram (alternative spelling: gramme; SI unit symbol: g) is a metric system unit of mass. A gram is defined as one thousandth of the SI base unit, the kilogram, or 1 × 10−3 kg.
10,000 yards (9,100 m) at 20°, 12,000 yards (11,000 m) at 24° [note 3] The QF 4.7-inch gun Mks I, II, III, and IV [note 4] were a family of British quick-firing 4.724-inch (120 mm) naval and coast defence guns of the late 1880s and 1890s that served with the navies of various countries. They were also mounted on various wheeled carriages to ...
The QF 4.5 inch gun has been the standard medium-calibre naval gun used by the Royal Navy as a medium-range weapon capable of use against surface, aircraft and shore targets since 1938. This article covers the early 45- calibre family of guns up to the 1970s. For the later unrelated 55-calibre Royal Navy gun, see 4.5 inch Mark 8 naval gun.
A 4.7 inch Gun is any of a number of British-built 120 mm naval artillery guns. Several of these guns were designed and manufactured by the Elswick Ordnance Company, part of Armstrong Whitworth. They were a major export item and hence were actually of 120 mm calibre (4.724 inches) to meet the requirements of metricised navies (although the size ...
[8] [9] Savage was the exception in this respect, being fitted with 4.5 inch calibre; a twin mounting forward and two singles aft. The 4.7 inch calibre was superseded by the 4.5 inch calibre on the Z-class destroyers in 1943. The new 4.5 inch guns all had 55-degree elevation mounts and fired a shell slightly heavier than that of 4.7-inch Mk IX ...
The QF 4.7-inch Mk XI gun, on the Mk XX twin mounting, was introduced to the RN aboard the L and M class destroyers, in commission from 1941 onwards. It featured a 62 lb (28.1 kg) shell fired at 2,538 ft/second (774 m/s) to a maximum range of 21,240 yards (19,420 m) at 45 degrees of elevation. [1] The Mk XX mounting was fully enclosed, but the ...
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