"New Optex" Datum Rule

Made:
1930-1940 in United Kingdom
"New Optex" Datum Rule

"New Optex" Datum Rule
Science Museum Group
© The Board of Trustees of the Science Musuem

Spectacle frame gauge, made by John Baird & Sons.

Details

Category:
Ophthalmology
Object Number:
Y1997.9.24
Materials:
plastic (unidentified) and metal (unknown)
Measurements:
overall: 13 mm x 204 mm x 100 mm,
type:
datum rule
credit:
Gift of Selby & Glover