File:AmCyc Boring - Drill with center pin and shearing point on the side.jpg
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AmCyc_Boring_-_Drill_with_center_pin_and_shearing_point_on_the_side.jpg (227 × 365 pixels, file size: 24 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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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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