Slit-lens, double image micrometer telescope H.O.4

Made:: 1851-1860 in Brest

Slit-lens, double image micrometer telescope H.O.4, in mahogany case with two brass keys and a reading lens, one key clamps to end of rod for separating the half lenses, telescope 2' 7 1/8" long when closed, diam. 2 11/ 16" at each end, leather covered draw tube engraved No. 32 Micrometre Lugeol par Colombi brevete Brest, silvered carriers at O.G. end "GGB No.32, Brest 1851, scales on silver nod 0 to 5 each way subdivided to 12 parts, 30 verniers

Details

Category:: Astronomy

Object Number:: 1911-232

Materials:: metal, mahogany, brass and glass

type:: micrometer telescope

credit:: British Admiralty (Hydrographic Department)

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Parts

Micrometer, double image H.O.4

Micrometer, double image H.O.4, two brass keys and a reading lens, one key clamps to end of rod for separating the half lenses, telescope 2' 7 1/8" long when closed, diam. 2 11/ 16" at each end, leather covered draw tube engraved No. 32 Micrometre Lugeol par Colombi brevete Brest, silvered carriers at O.G. end "GGB No.32, Brest 1851, scales on silver nod 0 to 5 each way subdivided to 12 parts, 30 verniers