Society of Glass Technology · [Sheffield] · leaf 552
he bulbon the tube between E andP is intended to prevent airrushing into E when the pumpis stopped. The pump is saidto work very quickly and has evacuated a McLeod manometer of 500 c.c. down to 0-0007 mm. inten minutes and to 0-00011 mm. in twenty minutes from an initialpressure of 10 mm. The… … Fig. 109. 218. A Glass-cutter. 0. B. Gerdin (U.S.A. Pat. No. 1375958,April 26th, 1921. Filed January 21st, 1920, No. 353,078).—Thisglass-cutter consists of a short length of metal tube, 1 (Fig. 110), whichis provided at its end with slots, 2, for slidably containing the endpieces, 3, which are…
Glass
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