Society of Glass Technology · [Sheffield] · leaf 494
le the contents of the oven to be readily manipulated, a small low voltage electric bulb, C, isplaced at the closed end of the tube and is controlled by theswitch, R. M. P. 84. An Electric Flue-gas Tester. C. 0. Friedrich (Chem.Zeitung, 1922, 848).—The method was based on the difference in… … Fig. 20.
Glass
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