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US Patent: 523,733
Drawing-Instrument Adjustable Triangle
Patentee: Edmund L. Samuelson (exact or similar names) - Waltham, MA USPTO Classifications: 33/426 Tool Categories: layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: H. P. Field E. N. Reid F. McArdle C. Sedgewick	Patent Dates: Applied: Jun. 17, 1893 Granted: Jul. 31, 1894 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a draftsman's triangle with a build-in protractor, allowing it to easily mark any angle.

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