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

Wolf-tooth gears

Chronometry; Clock

A buttress-shaped gear profile, sometimes used in the winding work of high-class clocks. It is stronger than the normal symmetrical tooth shape, which allows power transmission in both directions.

Built about 1945 this unique clock was housed in a four-glass brass case. A set of sealed glass tubes was partially filled with alcohol and formed in the shape of a wheel, and a small electric light ...

Altitude sundial

Chronometry; Clock

It is possible to measure time from the sun's altitude when the date is known. Portable altitude dials with a date setting scale take a great variety of forms, including the chalice, crescent, ...

Altar clock

Chronometry; Clock

Clocks with wooden cases were rare before 1660, but as the pendulum became established wood was used in greater quantities. Clocks began to be made with wooden cases shaped like the altars of the ...

Adjusting

Chronometry; Clock

Adjustments made to the balance, balance spring or pendulum of a clock to compensate for the effects of variations of temperature are known as compensating. Adjusting refers specifically to minor ...

Alarm

Chronometry; Clock

Sound a clock makes to awaken the sleeper at a certain time. They come in various sounds: bell, double bell, chirp, beep, buzz, melody, etc.

Zappler clock

Chronometry; Clock

A miniaturisation of the standing Telleruhr made in Austria. They are only about 2in. High. The name is derived from the rapidly moving pendulum suggesting the German 'fidget'.