nstant pressure upon the diamond cut- nineteenth century witnesses the triumphant completion of company are purely American, and have been evolved from ter, whether it cuts fast through soft streaks, or slow through the fertile genius of Mr. John North, of this city, an engineer mining and… … can Institute with com- have been surmount- COMPANY’S pressed air, supplied ed, until, at the pres- As best illustrating these machines in theirimproved form, from a compressor, also on exhibition, and has formed a very ent time, there is probably no material that will do as much interesting…
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