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Title: Collimator telescope, 1 1/2-inch aperture and 10-inch focal [Go to resource]
Description: Collimator telescope, 1 1/2-inch aperture and 10-inch focal length, and mahogany case, by Troughton & Simms, London. Used for levelling and adjustment of a transit instrument. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: collimator telescope Temporal: 1860-1880 Source: Science Museum Creator: Troughton & Simms Identifier: 2001-687 Go to resource More Like this...
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