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A
good source in information about the manufactures of Surveying Instruments can
be found at the Smithsonian National Museum of American History, Behring Center, Physical Sciences Collection, Surveying and Geodesy website page:
Specific information about Surveying and Navigation instruments manufactured by Troughton & Simms, LTD, London can be found on the Smithsonian site at the following links:
Additional information on
instruments manufactured by Troughton & Simms, LTD, London can be found at
the following links:
A Short History Of Troughton & Simms by
Roy Gooding:
Vickers Scientific Instruments:
Powerhouse Museum Collection, Sydney, Australia:
UKBookWorld.com, note this ia a commercial site:
D'Hub / project of the Powerhouse Museum Collection, Sydney, Australia:
Opticalia Museum (Note that a part of this site is a commercial site):
Janus, Cambridge University:
JSTOR:
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