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ID number:  BIRRC-P0322
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Troughton and Simms
Title / Object name:  Transit Telescope
Object type:  Astronomical instrument
Place made:  London
Date made:  c. 1909
Materials:  Brass on steel support
Measurements:  Telescope length 80 cm, diameter 5.5 cm Stand 45 x 25 x 51 cm

In 1909 to set the rate of the standard clock (P0831) it was necessary to make observations of the stars. This telescope was mounted in a South facing window at the top of the Poynting Building to determine the time of transit of a chosen star across the meridian. It was mounted to tilt only about a fixed horizontal axis so that the azimuth could be adjusted from day to day. A spirit level and scale record the azimuth.

Inscriptions / Translations:  Troughton & Simms London
B’ham. Univ. Physics A3

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