Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 307
Fig. 7. Mounted Tantalum Filament Showing Appearance afterConsiderable Use and after Filament Has Disintegrated oxychloride mixed with just the proper proportion of hydrogen, inwhich case the filament gradually changed to one of tunsgten. Asecond method consisted of the use of powdered tungsten and…
Electrical engineering
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