Title
Moving glass plate and slits
Identifier
ABDNP:200643b
Description
One of two sets of two slits and 2 glass pieces with a third glass piece in the centre which can be rotated by turning a dial which has a pointer attached. The pointer over lies a yellow plastic protractor.
Date
1800
Format
height 175mm, length 178mm, width 135mm
wood, metal, plastic
Creator
Unknown