A segment apparatus of early form, with two circular plates of lacquered brass each rotating on a fixed inner part to bring two steel stops nearer or further apart, and steel thumb catches engaging at any point on the 360° graduated circles, in one degree steps
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A segment apparatus of early form, with two circular plates of lacquered brass each rotating on a fixed inner part to bring two steel stops nearer or further apart, and steel thumb catches engaging at any point on the 360° graduated circles, in one degree steps
Lot Essay
This form of segment apparatus is not referred to in any of the standard works. Others have been noted, mainly from the 1820-1830 period.
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Scientific and Medical Instruments & Other Apparatus