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US Patent: 1,422,345
Trammel
Ellipse Drawing Tool
Patentee:
William Douglas (exact or similar names) - Pawtucket, RI

USPTO Classifications:
33/31

Tool Categories:
layout tools : compasses : trammels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: May 07, 1921
Granted: Jul. 11, 1922

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
This is an ellipsograph that is designed to attach to a normal framing square. The claims recommend it as being particularly useful to stair builders.

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