Clock showin sidereal time

Deutsches Museum
  





Native name
Deutsches Museum

Parent institution
Leibniz Association 

Location
Munich

Coordinates
48° 07′ 48″ N, 11° 35′ 00″ E  

Established
1925

Website
www.deutsches-museum.de

Authority file

: Q131617
VIAF: 317277482
ISNI: 0000 0004 0492 4948
LCCN: n82060362
GND: 1007827-7
SELIBR: 336601
WorldCat



institution QS:P195,Q131617
Deutsch: Pendeluhr für Sternzeit, erbaut 1909 (Teilansicht)
English: Face of a Riefler astronomical regulator clock, made by the Clemens Riefler Co. in Munich Anno 1909. One of the first clocks to have a low thermal expansion invar pendulum rod (not pictured), this was probably the most accurate clock in the world around the turn of the century. It was typically accurate to 15 ms per day, and was guaranteed to be within 20 ms. Like many precision regulators, the gear train was made with as few gears as possible to reduce friction-induced error. As a consequence the minute and hour hands are not mounted at the center of the dial but offset on the ends of their driving gears. The small moon-shaped hole in the face allowed the action of the electric remontoir which drove the clock to be viewed.