MAKE A MEME
View Large Image
| View Original: | Clock showin sidereal time.jpg (1552x1683) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Clock showin sidereal time.jpg Institution Deutsches Museum Deutsches Museum Uhr für Sternzeit Face of a Riefler astronomical regulator clock made by the Clemens Riefler Co in 1909 now in the Deutsches Museum Munich One of the first clocks to have a low thermal expansion invar pendulum rod 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 own 2010-08-30 User Mattes Riefler-clock Deutsches Museum - Schifffahrt Shipping and Marine navigation Sidereal time Work by Mattes 2010 Taken with Fujifilm FinePix S5700 User Mattes/Contributions/Topics/Germany/München User Mattes/Contributions/Topics/Technology | ||||
