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A boxed brass theodolite Troughton & simms, CIRCA 1910 London It has a number of small lenses, attached as well as loose. bottom section 260mm high, and 200mm in diametre Top section 320mm in length and 165mm in diametre. In original wooden box.
For further information on this Troughton & Simms Theodolite follow this link
http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/51626/
COURTESY OF SMITHSONIAN COLLECTION