US Patent: 778,808
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| Combined Square and Bevel Protractor
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Patentee:
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| Laroy S. Starrett (exact or similar names) - Athol, MA |
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Patent Dates:
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| Applied: |
Sep. 25, 1903 |
| Granted: |
Dec. 27, 1904 |
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Joel Havens
"Vintage Machinery" entry for L. S. Starrett Co.
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Description: |
| Abstract:
This invention combines in one tool a square, bevel-protractor, inclinometer, plumb, and level without the complexities which have sometimes accompanied tools for one of such purposes only. The characteristic feature is a headstock or body having slotted working faces perpendicular to each other rand an intermediate face oblique to and connecting both with a spirit-level adjacent and parallel to each perpendicular face, a graduated ring located in a circular opening through the headstock near its apex and equidistant from said slotted perpendicular faces, and a longitudinally - movable grooved or slitted measuring-blade held to said ring and adjustably in the slotted perpendicular faces and angle of the headstock by partial rotation of the ring.
Claim:
The described tool, comprising the headstock or body, having arms at right angles to each other, and edgewise-working faces perpendicular to each other, each slotted from end to end to a uniform depth to form a blade- seat, in combination with a ring mounted to oscillate in the apex of said stock or body and with a straightedge or measuring-blade held to said ring and made adjustable into such slotted faces and intermediate position. |
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