optical bench screen

ABDNP:200641e

Tall paper covered wooden screen on top of a wooden base with groove for optical bench and 2 metal pointers on base. 3 cut sheets of paper (backs of old forms) have been used and slotted in to the built in grooves.

1800

base: height 61mm, length 64mm, width 80mm
screen: height 150mm, length 78mm, width 7mm

wood, paper

Unknown