is crush broader than their top, and there being no under cutting, as any hard or brittle substance so as to cut or wear away its ing in a mill, A; the mill has three rolls, each 6 feet 61 is apt to occur in etching on metal rtithacid. An electro- surface. inches long by 2 feet 7-J inches diameter.… … ilar results to the Tilghman process, which we also illustrate. animal charcoal, which material in the present instance is The latter patent bears date November 21st, 1871. For ordinary rough woik, such as cutting stone, where a contained in 10 cylindrical vessels 3 feet 7 inches in diameter The…
Patents · Iron · Inches · Chicago · Scientific American · Tuns · Steam engines · Sal ammoniac · Wrought iron · Square inch · Cast Iron · Post office · Horse power · Steam engine · Patent office
Internet Archive · Public domain (published before 1931). Free to use for anything.
