OCR Text |
Show LITHOGRAPHIC STONES. It was staled in yesterday's Times that a species of stone adapted for lith-ographio lith-ographio purposes had been discovered in Utah couuty, seventy-live miles south of Salt Lake City. If this stone is really suitable in every respect for lithographing, lithograph-ing, tho discovery is a very valuable one, arf iirst-class lithographing stouo is found in a very few places. The only quarry in this country is in Missouri, Mis-souri, and tho stone from that section is not considered lirst-class. The best lithographic . stones aro found at Kcl-he'uu Kcl-he'uu and Solouhofen, near Pappeu-heim, Pappeu-heim, ou tho' Danube, in Bavaria. Stones of poorer quality havo beeu found in Silesia, England, Frauce, Canada and the West Indies. Lithographic stoiies - are composed com-posed of lime, clay and silicious earth, aud are of various hues, from a pale yellowish-white to a light buff, reddish, pearl-gray, light-gray, bluo aud greenish color. Those of uniform uni-form color aro the best. The yellow-buff yellow-buff oues, beiug software adapted for lettering aud trausfer; the pearl-gray oues, being heavier, for chalk drawings aud engraving. They are found in beds, commencing with hiyers of the thickness of paper, till they reach the dimensions of oue hud several inches in thickness, wheu they aro easily cut, being soft iu the quarries, to tho sizes required for printing purposes. Tho stones aregrouudpl.mewith sand, and, when reij uired for tho pen, tho brush, tho gravur or trausfer, they are polished pol-ished with pumice and wator-of-Ayr stone, and for chalk drawings aud graduated grad-uated tints, au artificial grain is given by ground glass or tiiie sand. |