Folding Sector Rule

folding sector

INSTRUMENTS
wood; metal
overall: 6 x 1 3/8 x 1/8 in. (closed); 12 x 5/8 x 1/8 in. (open)

Wood and bronze folding sector ruler. Measurement marks engraved on both flat sides and exterior edge. Multiple scales visible. Scales on Frontal Linear: SI, TSN; Frontal Radial: STT, STT. Back Liner: Unlabeled Gunter's Rule; Back Radial: LSC, LSC. Part of mathematical instrument set 1977.92.1433.ab. Overall good condition. Overall: 6 x 1 3/8 x 1/4 in (closed); 12 x 5/8 x 1/4 in. (open).

1977.92.1433.A.1