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Harrison's first "sea watch" (now known as H4) is housed in silver pair cases some 5.2 inches (13 cm) in diameter. The clock's movement is highly complex for the period, resembling a larger version of the then-current conventional movement. A coiled steel spring inside a brass mainspring barrel provides 30 hours of power.
The Molnija movement is basically a copy of a Cortébert movement used in Swiss watches from around 1940. [2] About 80% of the work on most of the watches was done by hand. Some Molnija movements were used in oversized men's wristwatches. Early Molnija pocket watch movements (from 1947 to c. 1960) normally had 15 jewels.
The Astrarium of Giovanni Dondi dall'Orologio was a complex astronomical clock built between 1348 and 1364 in Padova, Italy, by the doctor and clock-maker Giovanni Dondi dall'Orologio. The Astrarium had seven faces and 107 moving parts; it showed the positions of the sun, the moon and the five planets then known, as well as religious feast days.
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).
[2]: 172 Start was around 8 or 9 o’clock in the morning. Four or five hours later, the Indians made a new camp. The fur traders lived in the tipi of an attentive Crow family. [2]: 182 After an attempt of theft of a gun, the camp chief arranged for two night guards outside the tipi. On July 2, a number of lodges collapsed in a shower of large ...
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Louis Achille Brocot (pronounced "broco" [1]) (11 July 1817 – 19 January 1878) was a French clockmaker [2] and amateur mathematician. [3]He is known for his discovery (contemporaneously with, but independently of, German number theorist Moritz Stern) of the Stern–Brocot tree, a mathematical structure useful in approximating real numbers by rational numbers; this sort of approximation is an ...
The expedition of Semyon Dezhnyov by Klavdy Lebedev Pere Marquette and the Indians at the Mississippi River, oil painting (1869) by Wilhelm Lamprecht (1838–1906), at Marquette University. 1600–01 – Prince Miron Shakhovskoi and D. Khripunov descend the Ob to the Ob Estuary and ascend the Taz River , establishing the ostrog of Mangazeya ...