拍品 431
431
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

細節
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

拍品專文

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.