OCR Text |
Show Cutting -Hauii Srtia, with Soft Iron. Mr. Jacob Keesool Pittsburgh had been endeavoring to construe a machine to cut hardemcd cold steel, j Ho accomplished it at length by : means of a saw of soft wrought iron-merely iron-merely a circular disc rotating at high velocity. With low speed this would not cut at all; hut when run-ning run-ning at about 2-3,' 00 feet per minute the disc cut through steel rapidly, giving out an imnienso cascade ol sparks in the operation. It was found hi: examining tho debris beneath the disc that tiie particles ol'nteel wen; not simply rubbed off. They were wcldul together in a pyramid like a stalagmite stalag-mite or the biiuw icicles formed on the top of Mount Washington. Pro!. 1 lbidrirk ascertained thai real fuKiou hud taken place among the- particles of decl. Tne disc is very liltlu in-alid, but the steel is aetu Uly niclud and dropr. down. Vet tin; bar on each bide of tlx rut is not healed enough to draw tne temper or oxidize the metal. Solid bars of steel oi 2 inches or 3 inchr-H in diameter are thin cut through in as many minuter. T he fcolt metal di;-;c ia about 'l inches in diameter. The niked hand may but pas-ed through tho jet or Hlrearn of living sparku during the operation willio.it buitig burned, since Lite particles par-ticles of melted metal are in the condition con-dition known as ihe spin loidal btatc. Jii'l- jitiulctit. |