Society of Glass Technology · [Sheffield] · leaf 217
thebubbles reached fairly large dimensions (Plate 4). If, in order to avoid the formation of bubbles, the current, waspassed for only short lengths of time (say, one to three seconds atintervals of one second), its effect was so slight as to be negligible. Casting under Air Pressure It was thought… … THE CASTING OF POTS FOR USE IN EXPERIMENTAL WORK. 147 Experiments were consequently made on the casting of potsunder a considerable pressure. The apparatus used is outlined inthe accompanying diagram (Fig. 4). It consists of a cast-irontank with a well-fitting and removable lid. In the side of…
Glass
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