£160
AN ARTIFICIAL HORIZON, CIRCA 1902
unsigned, of typical form, ebonised cast iron tray, oxidised brass and glass tent and turned steel mercury flask, secured within original box of issue with Kew Observatory certificate dated 1902, facsimile notes, handle and original key of issue -- 5½ x 7¼in. (13.5 x 18cm.)
fine overall condition, mercury drained
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