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Picture archive > Search results > YAH001845
Patent Model for Parallel Rule and T-Square by Eugene Towne
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| Caption | This instrument has a wooden handle attached by a large brass thumbscrew to a brass protractor that is divided to single degrees and numbered by tens in both directions from 10 to 170. The protractor is screwed to a rectangular brass piece that slides in a groove in a rectangular wooden guide-piece. The guide-piece has brass clamps and thumbscrews for affixing the instrument on a table. The protractor is also attached by a split nut to a metal screw shaft that runs the width of the instrument. A thumb rest and gear on the left clamp rotates the screw shaft. Date: 1870s. Record ID: nmah_690213. |
|---|---|
| Creator | Eugene J Towne, maker |
| Artwork medium | unknown |
| Credit | National Museum of American History |
| Terms of use | Public Domain Dedication (CC0 1.0) |
| Search stock images by keyword | Patent Model Parallel Rule T-Square Eugene Towne instrument wooden handle attached brass thumbscrew protractor divided single degrees numbered tens both directions Drafting Engineering Parallel Rules Inventions Science Mathematics Protractors Eugene J Towne |
| Stock image ref | Size | Views |
|---|---|---|
| YAH001845 | 2,000 x 1,335 pixels | 65 |
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