File:AmCyc Boring - Drill with center pin and shearing point on the side.jpg
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| Description |
English: Woodcut/drawing of a drill bit with center pin (to ensure a straight hole) and shearing point on the side (to ensure a clean cut). |
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| Date | |||
| Source | The American Cyclopædia, v. 3, 1879, p. 98 (Fig. 2). | ||
| Author | Unknown author | ||
| Permission (Reusing this file) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:34, 20 March 2014 | | 227 × 365 (24 KB) | Library Guy | {{Information |Description ={{en|1=Woodcut/drawing of a drill bit with center pin (to ensure a straight hole) and shearing point on the side (to ensure a clean cut).}} |Source =''The American Cyclopædia'', v. 3, 1879, p. 98 (Fig. 2). |Autho... |
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