Master clocks

Title

Master clocks

Subject

Astronomy
Clocks
Measuring instrument

Description

Wood, glass, metal

There are two 60 beat with a Graham dead-beat escapement with micrometer adjustment. Magnet wound, spring drive, self-regulating movement, 63 1/6” x 19 ¼” x 7 5/8”, plain glass door, 12” Arabic dial, white with black numbers, separate hours and smaller seconds circle. There is a one second switch as well as a 59 second switch. Pendulum is a mercurial compensating pendulum, 45 5/16 inches long and approximately 11.5 pounds, accurate to 10 seconds over a 30-day period. Clock is automatically wound with reserve power for approximately 12 hours. Clocks are housed in a walnut wood case with a glass door and two locks. A=central standard time (south side of pier), B=local sidereal time (east side of pier). Clock serial numbers are 462905 and 462904. Included in the purchase order was the new switching wiring and metal storage cabinet and control panel outside the clock room. Paper instructions included.

Replaced the original 1896 Clemens Riefler clocks both of which are now part of the Alder Planetarium collect.

Creator

IBM

Publisher

Astronomy Department, University of Illinois, Urbana, Illinois

Date

1954

Contributor

Michael Svec

Rights

Copyright Michael Svec

Format

image/jpg

Language

English

Type

physical object

Identifier

University of Illinois Observatory Collection A211.1, 211.2
University ID 196631A, 196631B

Coverage

University of Illinois Observatory, Urbana, Illinois

Files

IBM master clock
DSCN0280.JPG
DSCN0429.JPG

Collection

Tags

Citation

IBM, “Master clocks,” University of Illinois Observatory Collection, accessed September 19, 2017, http://uiobservatory.omeka.net/items/show/19.

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