Evening Republican, Volume 17, Number 206, Rensselaer, Jasper County, 29 August 1913 — Saws Without Teeth. [ARTICLE]

Saws Without Teeth.

The employment of circular disk* at iron, turning with great velocity, but possessing no teeth on the edge, for sawing material, is common in many workshops. Among other places where such saws without teeth are used are the oelehrated Krupp gun works, where armor plate Is sometimes out in this manner. The process Is not a newly discovered one. Am long ago as 1814 Barrier and Colladon, at Geneva, experimented with swtftly-rotatlng disks of iron. They found that when a disk about seven inches in diameter turned with a peripheral velocity of ten meters per second, it could be cut with a steel tool pressed against it, but that when the velocity was increased to 21 meters per second the iron was unaffected and the steel tool was damaged. At a velocity of 60 meters per second the iron disk even sat quarto HR! --- - -- - —v- /■'