Standard 6" diagonal scale in case; brass 6 7/8" x

Made:
London
maker:
John Bird

Standard 6" diagonal scale in case; brass 6 7/8" x 3 7/16" screwed by 4 screws to mahogany base with a mahogany cover, overall size with cover on is 7 7/8" x 4 1/8" x 7/8", diagonal scale gives thousandths, engraved "John Bird London"

Details

Category:
Mathematics
Object Number:
1911-184
Materials:
base & cover, mahogany, scale, brass
type:
drawing instruments
credit:
J.C. Stevens Auction House
status:
Permanent collection

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