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US Patent: 111,715
Improvement in Compass-Joints
Patentee:
Theodore Alteneder - Philadelphia, PA

USPTO Classifications:
33/558.5

Tool Categories:
layout tools : compasses

Assignees:
None

Manufacturer:
T. Altenader - Philadelphia, PA

Witnesses:
H. A. Daniels
G. B. Towles
W. Burris

Patent Dates:
Granted: Feb. 14, 1871

Patent Pictures:
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Description:
This is an improvement to his 1850 compass patent (#7,501), which uses a bone disk between the legs to reduce friction.

Alteneder was a well-known manufacturer of drafting tools, but it is not known if tools using this design were ever produced by them.

Known examples marked with manufacturer name and patent date.

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