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US Patent: 181,331
Improvement in Dividers
Patentee:
Adolphe Gruber - Boston, MA

USPTO Classifications:
33/27.02

Tool Categories:
layout tools : compasses : dividers

Assignees:
L. Prange & Co. - Boston, MA

Manufacturer:
L. Prange & Co. - Boston, MA

Witnesses:
R. H. Eddy
J. R. Snow
S. W. Piper
L. W. Tröller

Patent Dates:
Applied: Apr. 24, 1876
Granted: Aug. 22, 1876

Patent Pictures:
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Description:
This divider features a reversible point, one side of which is a drafting pen, and the other a pencil holder. The primary patent claims are for a small nib in the arm that allows accurate alignment of the reversible arm.

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