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The geological clock: a projection of Earth's 4,5 Ga history on a clock ("Ma" = a million years (Megayear) ago; "Ga" = a billion years (Gigayear) ago) Date: 31 October 2010, 06:53: Source: This file was derived from: Geologic clock.jpg: Author: Woudloper; Derivative work: Hardwigg; Permission (Reusing this file)
Johannes Sayler (1597–1668), German watchmaker, Ulm, rolling ball clock, turret clocks, table clocks. Nicolas Lemaindre (1598–1652), French clockmaker, Blois, clockmaker of the court. Jost Bodeker von Wartbergh, German vicar, Osnabrück. craft clock with a centrifugal pendulum (1578 to 1587).
c. 3500 BC - Egyptian obelisks are among the earliest shadow clocks. [1] c. 1500 BC - The oldest of all known sundials, dating back to the 19th Dynasty. [2] c. 500 BC - A shadow clock is developed similar in shape to a bent T-square. [3] 3rd century BC - Berossos invents the hemispherical sundial. [4] 270 BCE - Ctesibius builds a water clock.
The Doomsday Clock is a symbol that represents the estimated likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the Clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances. That is, the time ...
The English word clock first appeared in Middle English as clok, cloke, or clokke. The origin of the word is not known for certain; it may be a borrowing from French or Dutch, and can perhaps be traced to the post-classical Latin clocca ('bell'). 7th century Irish and 9th century Germanic sources recorded clock as meaning 'bell'. [74]
A new firm known as Howard Clock Products was formed November 5, 1934, to succeed the earlier firm. Clock production was on the wane, but precision gear cutting business kept the firm profitable, particularly from government contract work. Production of smaller clocks ceased in 1957 or 1958 and the last tower clock was produced in 1964.
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A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...