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Title: Portable transit instrument, 1840-1860 [Go to resource]
Description: Portable transit instrument of 2�-inch aperture and 24-inch focal length, with striding level and lamp, by Troughton and Simms, with wooden box and cast iron stand. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: transit instrument Temporal: 1840-1860 Source: Science Museum Creator: Troughton & Simms Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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