File:AmCyc Boring - Ingersoll Drill.jpg
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DescriptionAmCyc Boring - Ingersoll Drill.jpg |
English: Woodcut/drawing of an Ingersoll rock drill. It is especially effective in excavating open cuts. c is the cylinder, s the steam or compressed air chest, h the pipe which supplies the compressed air, and p the screw for moving the drill forward, which may be done by the hand or by the rod g, which is turned by an automatic ratchet movement. |
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Date | published 1879 | |||||||
Source | The American Cyclopædia, v. 3, 1879, p. 100 (Fig. 19). | |||||||
Author | Unknown authorUnknown author | |||||||
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current | 18:23, 25 March 2014 | 481 × 958 (136 KB) | Library Guy (talk | contribs) | {{Information |Description ={{en|1=Woodcut/drawing of an Ingersoll rock drill. It is especially effective in excavating open cuts.}} |Source =''The American Cyclopædia'', v. 3, 1879, p. 100 (Fig. 19). |Author =unknown artist |Date... |
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