Ah WEEKLY JOURNAL or “PRACTICAL. INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY. AND MANUFACTURE Vv 1. XT V cee D.15. $3 PEK ANNUM arate a NEW YORK, APRIL 7, 1866. theca GRINDSTONES. carried on. As, for instance, in Figure 2, the | holes iron wedges, one and a half inches square by workmen are in…
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