Clock
The term large clock is a general term for all larger, stationary wheel clocks , or clocks that are not worn directly on the body. In contrast, the portable watches , such as pocket and wrist watches , are called small watches .
A distinction must be made between clocks, which are called large clocks or small clocks because of their dimensions :
- The big clock counts 24 hours over a complete turn of the hand (360 °) .
- The small clock counts 12 hours with one hand rotation.
history
Water clocks and hourglasses were used as the first large clocks before the development of mechanical clockwork . Mechanical large clocks first appeared at the beginning of the 14th century.
The distinction between large and small clocks has been made for centuries based on their type of drive. As clocks watches were referred with weight drive while Klein watches with spring drive were equipped. Accordingly, the manufacturers of weight-driven clocks were called large clockmakers and the manufacturers of spring-driven clocks (including back clocks , table clocks, etc.) were called small clockmakers . Small and large watchmakers even worked in separate guilds at times .
Later the division was made according to the work thickness. According to this, clocks are those “whose movement thickness is generally equal to or more than 12 mm. Large clocks are wall clocks , floor clocks , alarm clocks , travel clocks , tower clocks ”.
Today clocks are no longer named according to their type of drive or thickness, but rather according to their external appearance and unchangeable position. Large clocks include all public clocks. But a clock does not necessarily have to be extremely large. Smaller grandfather clock models also belong in this category. Furthermore, large clocks are divided according to their drive into weight clocks, spring clocks, compressed air clocks or electrical clocks.
Instead of a subdivision of the clocks according to their drive, a subdivision can also be made according to the regulator , z. As sundials , water and sand clocks, ball watches, restlessness watches, torsion pendulum watches, clocks , balance clocks with coil spring , synchronous motor clocks , tuning fork watches , quartz watches , atomic clocks , and radiometric dating (synonym geodetic pm ).
Individual evidence
- ↑ Fritz von Osterhausen: Callweys lexicon. Munich 1999, ISBN 3-7667-1353-1 , p. 128
- ↑ Viktor Pröstler: Callweys manual of the clock types. From the wristwatch to the zappler. Callwey Munich 1994, ISBN 3-7667-1098-2 , p. 46
- ^ J. Hottenroth: The pocket and wrist watch. 2 volumes. Pforzheim 1950.
- ↑ a b c d G. A. Berner: Illustrated specialist dictionary of watchmaking . Retrieved October 22, 2012
- ↑ uhrenhanse.de: lexicon large clock