Some kind of calibre (1156)
Index: 1156
Year: ?
Maker: ?
Dimensions: 13 x 3 x 0.1 cm
Info
Brass plate with indents (possibly wire) with numbers punched below each indent. These start in the middle from 1. To the right, 1 to 13 with gaps enlarging. To te left, 1 to 14 with a 0 below it. These get smaller to the left. Difficult to measure, but some measures (number=gap width in mm): 1 = 1.3, 10 = 1.94, 13 = 2.3, 7/0 = 1.02, 14/0 = 0.74.
On both sides, there a concentric circles punched. These circles have a punch mark in the middle, would assume to put the center of a divider in it.
At the front, the circles are numbered (from largest to smallest): 5 14, 6 15, 7 16, 8 17, 9 18. On the back, largest to smallest: 1 10, 2 11, 3 12, 44 13.
Eg for the 5/14 circle, the diam of the circles are 17.6 and 12.8 mm.
