Society of Glass Technology · [Sheffield] · leaf 542
throughthe valve, Z, which it opened and up into T until the current throughthe interrupter was broken. The weight of mercury in T now FUELS, REFRACTORIES, AND FURNACES. 141 closed the valve, Z, which had a pinhole in it, allowing the mercuryto return slowly to M until the circuit was once again… … urna.ce Fig. 98. 1—2 kilowatt furnace the mercury should take about ten secondsto re-establish contact after break. The heating and coolingcycles went on automatically, and it was claimed that a furnaceas above could easily be maintained at a given temperature to ± 1°- M. P. 160. A Thermocouple…
Glass
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