Electrical novelties : the ultra vacuum electrodes, X-ray tubes and stands, the multiple spark interrupter, spark lamp to produce violet rays, spark regulator for coil, electric heaters, X-ray plates (1903)
Swett & Lewis Company, Boston · Boston : Swett & Lewis Company · leaf 18
apparatus ex-clusively. Outfit No. 31 Code Word —Unqueened One direct current Kinraide Coil $200.00 Two tubes, type K 30.00 One 5 X 7 platinum barium cyanide fluoroscope ..... 12.50 One floor tube stand, with adjustable spark gap for controlling vacuum, 10.00 One rheostat 8.00 One set of electrodes…
Electric apparatus and appliances · X-rays · Electrical Equipment and Supplies
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-156-44.webp)
