20 Terms
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Clock
Any instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
Industry: Chronometry
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Clock
sextant
Chronometry; Clock
A modification of John Hadley's octant made by Captain John Campbell c. 1771. Whereas the octant is in the form of a sector comprising one-eighth of a circle, the sextant occupies one-sixth of a ...
set-up
Chronometry; Clock
When a fusee clock is being assembled and the line or chain is wound on the barrel, the mainspring is pre-tensioned by winding the mainspring arbor, usually one half to one and a half turns, enabling ...
self-centering chuck
Chronometry; Clock
A useful chuck adaptable to many sizes of work. It has three or more radial jaws which close together on the work held by means of a screw or scroll inside the chuck, in such a way as to center the ...
sedan clock
Chronometry; Clock
The name given to small clocks which are traditionally associated with the 18th-century sedan chair, though there is no direct evidence that they were used exclusively for this type of conveyance, if ...
sector
Chronometry; Clock
A simple proportional measuring gauge consisting of two straight brass or steel arms, pivot-jointed at one end to form an adjustable gap gauge which is set to the required size (or gap) by a slotted ...
seconds train
Chronometry; Clock
A clock train suitable for a seconds-beating pendulum or, alternatively, for driving a hand indicating seconds.
seat board
Chronometry; Clock
The wooden board to which the movement of a longcase clock is attached by two screws through the lower movement pillars in London-made and other good-quality clocks, and by J-bolts in provincial ...
