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 14
s, $1.50Code Word — Finalisla [Ng] S V7 E T T & LEWIS COMPANY Electric Heater This is specially designedfor drying out Static Machines,and when used properly willkeep a Static Machine in run-ning order every day in the year. Heater, special cord, switch, 10-lb.can of fused calcium chloride,with… … Electric Heating Pad The cut shows this very useful article. This pad may be con-nected by means of the cord and plug direct to the lamp socket, andallowed to run for any length of time without danger of overheating,or shock to the patient. The temperature may be maintained at 180degrees Fahrenheit…
Electric apparatus and appliances · X-rays · Electrical Equipment and Supplies
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![An illustration from Illustrated catalogue of the extraordinary collection of art treasures and antiquities acquired during the past year by Professore Commendatore Elia Volpi ... to be sold at unrestricted public sale at the American Art Galleries [on Monday, Tuesday and Wednesday afternoon, Dec. 17th, 18th and 19th, 1917] (1917)](https://img.insideoutlibrary.com/img/200/ia-illustratedcatal00volp-184-124.webp)
