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Scientific American, Vol. 89, No. 22 (1903) (1903)
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l operations. In this portion-of the work- about an. hour was re- + or Ft quired, after which the rings at the mouth were fin- TWO NEW HACK SAWS. ished and the glass annealed in specially large ovens. A new type of double hack saw for cutting steel The bottles have been completed for a firm of… … By means of a novel attachment the soap-suds. In this case, the machine is capable of op- blades are inserted perfectly straight, erating at 100 revolutions a minute. and in cutting through a 12 x 5- The machine, which is represented in the accom. STILL, © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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