Society of Glass Technology · [Sheffield] · leaf 735
cold glass leftin the trough after a shut-down.In the construction shown in Fig.179, an electric resistance element,9, is built into the wall of thetrough, 10, and is connected byleads, 12, 13, with the currentsupply. In another construction,the leads, 12, 13, are connectedto terminals which are… … Fig. 179. two forms of the invention can be used together. G. D. MACHINERY FOR THE WORKING OF CLASS. 291
Glass
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