Clock

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

First invented in the 19th century by Carl August Steinheil of Munich University as a means of indicating time on a number of clocks simultaneously from a central master clock fitted with electrical ...

Impulse

Chronometry; Clock

That part of an escapement's cycle during which energy is transferred to the pendulum or balance from the escapement; also called 'lift'.

Hydrogen clock

Chronometry; Clock

A version of the hydrogen clock, also known as the gas-operated clock, is in the Clockmakers' Company Museum in London; it was designed by Pasquale Andervalt in Italy c. 1835. It consists of an ...

Pin-pallet escapement

Chronometry; Clock

In this escapement the pallets are made from small-diameter pins which engage the club-shaped teeth of the escape wheel, all the lift and draw being formed in the escape-wheel teeth. This escapement ...

Pinned plates

Chronometry; Clock

Taper wedging pins have been used from the earliest times to secure mechanical assemblies. In the usual pillar and plate assembly the pillars are riveted to the backplate and are reduced in diameter, ...

Pinion-milling machine

Chronometry; Clock

Pinions for watches and sometimes also for small clocks were usually made from pinion wire, but for larger clocks pinions were milled from a cylinder of steel left standing when the clock arbour was ...

Pinion-facing tool

Chronometry; Clock

A tool for finishing and polishing the end face of a pinion. A facing tool is made of soft steel or bell metal and used with coarse red stuff for squaring up the pinion face. For finishing or ...