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US Patent: 402,364
Azimuth-Instrument
Improved instrument for taking azimuths, using a fully reflecting prism
Patentee:
William Thomson (exact or similar names) - Glasgow, Scotland

USPTO Classifications:
356/143

Tool Categories:

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Edward Steer
F. A. Hopkins
Robert Adam Gunn
John Madder Fredhope

Patent Dates:
Applied: Nov. 05, 1885
Granted: Apr. 30, 1889

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Description:
The principal improvements over the inventor's US Patent 210,068 are the positioning of the two lenses that aid the reading of the azimuth and the substitution of the fully reflecting prism instead of a mirror, the latter being prone to deterioration in the marine atmosphere.

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