Harman's rule for measuring the occular base line

Made:
1890-1940 in London
maker:
Theodore Hamblin Limited
Harman's rule for measuring the occular base line

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Harman's rule for measuring the occular base line
Science Museum Group
The Board of Trustees of the Science Museum

Harman's rule for measuring the occular base line, personal relic of the inventor(?) N. Bishop Harman, made by Theodore Hamblin Ltd., London, W1, England, 1890-1940, in leather case.

Details

Category:
Ophthalmology
Collection:
Sir Henry Wellcome's Museum Collection
Object Number:
A651886
Materials:
steel and case, leather
type:
rules
credit:
Harman, N.B.