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John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.
By 2003, two rival groups were making plans for an expedition to find the wreck, [77] [78] but no expedition was mounted at the time. In 2010, Mearns announced a new plan to search for the wreck. The plan was sponsored by the National Geographic Society but was subject to finding sponsorship for the balance of the US$10 million estimated cost.
The expedition ship RRS Discovery in the Antarctic alongside the Great Ice Barrier, now known as the Ross Ice Shelf. The Discovery Expedition of 1901–1904, known officially as the British National Antarctic Expedition, was the first official British exploration of the Antarctic regions since the voyage of James Clark Ross sixty years earlier (1839–1843).
Part of the planning for the expedition had provided for a relief ship to follow a year later, in case Discovery was lost in the Antarctic; on reading a newspaper article about this some months later, Evans saw an opportunity for adventure and wrote to Sir Clements Markham, the organising force behind the expedition. He met Markham twice in the ...
Grasshopper escapement, 1820. The grasshopper escapement is a low-friction escapement for pendulum clocks invented by British clockmaker John Harrison around 1722. An escapement, part of every mechanical clock, is the mechanism that gives the clock's pendulum periodic pushes to keep it swinging, and each swing releases the clock's gears to move forward by a fixed amount, thus moving the hands ...
It suffers from these problems: Verge watches and clocks are sensitive to changes in the drive force; they slow down as the mainspring unwinds. [36] This is called lack of isochronism. It was much worse in verge and foliot clocks due to the lack of a balance spring, but is a problem in all verge movements.
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The South Polar Times was a magazine created by the crew of the two Antarctic voyages led by Captain Robert Falcon Scott in the early 20th century: the Discovery Expedition (1901–04), and the Terra Nova Expedition (1910–13).