St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 146
Fig. 220. Fig. 220-A. made for such study. Fig. 217 shows a plain tube ofthis kind, platinum terminals being fused in the glassfor connecftions. These tubes are often made in com-plicated forms. Fig. 218, with colored glass, and arecalled Geisslcr tubes. They are often made in such away that the…
Electricity
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