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Micrometer achromatic refracting telescope with lens cap

1825-1835
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

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

1851-1860
Micrometer telescope, Rochon type, with box, by Thomas Jones, 62 Charing Cross, London, England, c. 1830

Micrometer telescope

1840-1860
Micrometer telescope by T. Jones (Rochon type)

Micrometer telescope by T. Jones (Rochon type)

Rochon micrometrical telescope by Lenoir, early 19th century. A refracting telescope fitted with a sliding rock crystal (calcite) calibrated for angular measurements 0-36 arcminutes.

Rochon micrometrical telescope by Lenoir

1801-1832