Society of Glass Technology · [Sheffield] · leaf 532
of glass, A, has an endless groove, a, formed in its faceand of sufficient depth to cause refraction of light at the line whichit occupies. G. D. MACHINERY FOR THE WORKING OF GLASS. 101 182. Cracking-off Device for Carboys. H. M. Brown (U.S.A.Pat., July 13th, 1920, No. 1346528. Filed August 20th,… … Fig. 93. edge, 4. Perforations, 6, are formed in each jaw leading from theinterior through the edge, 4. In use, the tool is applied to the neckof the carboy while it is still hot and the handles, 2, 3, are tightenedto force the edge, 4, into the glass. Water is then circulated throughthe jaws by…
Glass
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