McCallam's patent distance indicator, 1864

Made:: 1864

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McCallam's patent distance indicator, 1864
Science Museum Group
© The Board of Trustees of the Science Museum

McCallam's patent distance indicator, 1864

Details

Category:: Surveying

Object Number:: 1865-1

type:: indicator

credit:: McCallum, D.

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McCallam's patent distance indicator, 1864

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