Society of Glass Technology · [Sheffield] · leaf 540
Fig. 39. 70. Perforating Glass. British Thomson-Houston Co.,London (General Electric Co., Schenectady, New York, U.S.A.)(Brit. Pat, No. 119589.) (January 4th, 1918, No. 238).—Glasswhilst in a plastic condition is perforated by pressing through itone or more pins made of a metal which is not wetted… … Fig. 40. series of pins are placed in apertures in a refractory block, 3, anda bead of glass, 7, carried by a stem, 8, is pressed on to the bentupper ends of the pins in a mould, 5, supported on a refractoryplate, 6, heated by a burner, 9. Fig. 40 shows the device thus 58 JOURNAL OF THE SOCIETY OF…
Glass
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