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The first known anchor escapement clock was built by the English clockmaker William Clement in 1671 for King's College, Cambridge, [131] now in the Science Museum, London. [132] The anchor escapement originated with Hooke, although it has been argued that it was invented by Clement, [133] or the English clockmaker Joseph Knibb. [132]
Historically it was the maritime measure of depth in the English-speaking world but, apart from within the US, charts now use metres. There are two yards (6 feet ) in an imperial fathom. [ 1 ] Originally the span of a man's outstretched arms , the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an ...
Dividers used for measuring lengths of lines and approximate lengths of non-linear paths on a chart. Nautical almanac used to determine the position in the sky of a celestial body after a sight has been taken. Parallel rules used for transferring a line to a parallel position.
The stockless anchor, patented in England in 1821, [11] represented the first significant departure in anchor design in centuries. Although their holding- power-to-weight ratio is significantly lower than admiralty pattern anchors, their ease of handling and stowage aboard large ships led to almost universal adoption.
The first patented long tape measure in the United States was granted on 10 July 1860 to William H. Paine, and produced by George M. Eddy and Company. [12] This design lacked any measurement points on it. Instead, it functioned as a singular unit of measurement, with the entire length of the tape representing a fixed distance. [13]
While young children display a wide distribution of reading skills, each level is tentatively associated with a school grade. Some schools adopt target reading levels for their pupils. This is the grade-level equivalence chart recommended by Fountas & Pinnell. [4] [5]
The chain is the unit of linear measurement for the survey of the public lands as prescribed by law. All returns of measurement in the rectangular system are made in the true horizontal distance in links, chains, and miles. The only exceptions to this rule are special requirements for measurement in feet in mineral surveys and townsite surveys ...