A rare mid 19th Century lacquered brass heliometer , (object glass micrometer) unsigned but stamped C.C.B. N°8 B. 1847 the 1¾in(4.5cm)diam., split lens adjusted by rack-and-pinion motion, with twin vernier scales divided 0-20/0-60, the telescope mounting -2¾in.(6.7cm)dia see illustration
A rare mid 19th Century lacquered brass heliometer , (object glass micrometer) unsigned but stamped C.C.B. N°8 B. 1847 the 1¾in(4.5cm)diam., split lens adjusted by rack-and-pinion motion, with twin vernier scales divided 0-20/0-60, the telescope mounting -2¾in.(6.7cm)dia see illustration
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