A LACQUERED BRASS SOLAR MICROSCOPE, PROBABLY 19TH-CENTURY unsigned, with 6½in. main tube with rack-and-pinion focus by slide assembly, mounted to back plate with vertical and horizontal key-turn mirror orientation -- the back plate -- 4¾in. (12cm.) square
A LACQUERED BRASS SOLAR MICROSCOPE, PROBABLY 19TH-CENTURY unsigned, with 6½in. main tube with rack-and-pinion focus by slide assembly, mounted to back plate with vertical and horizontal key-turn mirror orientation -- the back plate -- 4¾in. (12cm.) square
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