Orthops optical rule

Made:
1901-1930 in London

Orthops optical rule, wood and steel, by Raphael's of London, early 20th century

Details

Category:
Ophthalmology
Object Number:
1977-627/13
Materials:
boxwood and steel (metal)
Measurements:
overall: 4 mm x 230 mm x 55 mm, 0.024 kg
type:
optical rule
credit:
Spread Eagle Antiques