US Patent: 230,619 - Graduated Measuring Rule


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US Patent: 230,619

Graduated Measuring Rule

Patentee:

Samuel Darling (exact or similar names) - Providence, RI

USPTO Classifications:

33/490

Tool Categories:

rules

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

John E. Hall

Chas. A. Campbell

Patent Dates:
Applied:	Jun. 11, 1880
Granted:	Aug. 03, 1880

Patent Pictures:

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Description:

Metallic ruler with 45 degrees as the angle between the legs instead of the standard 60 degree construction. Also a line of pricks at an angle with the lines of graduation to allow divider to be set. Darling later references this patent in the text of patent 289,512.