Oscillating prism. A small glass prism connected to a brass mechanism with a crank.

ABDNP:200393a

Equiangular triangular prism, 13 mm side x 43 mm long (incl. brass ends) setting vertically on base made to oscillate 6 times for every rotation of an ivory handle. Could be the device mentioned in Copland's inventory. The design is very similar to the illustrations of C.R. Alder Wright

1790-1890

glass, brass, ivory
width 65 mm; depth (incl. handle) 52 mm; height 160 mm

Physical Object