US Patent: 12,820
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| Facing Bed for Grinding Artificial Granite, Etc.
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Patentee:
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| Benjamin Hardinge (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
May 08, 1855 |
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Joel Havens
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Description: |
| The nature of my invention consists in constructing a round, cast iron, saucer shaped dish, of .about 8 feet in diameter, and filling it with concrete cement: of silici-calcareous and, ferruginous frit ground arid mixed with coarse crude emery, steel turnings, sharp sand and hydrous silicates, with which it, is wet up into a plastic state, put into said dish, and leveled with a straight edged spatula, while in very slow motion so that, when hard, it turns in a perfect horizontal level, and runs as true as though it were turned in a lathe from a solid. |
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