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
for operation on direct-current circuits. TUNGSTEN VACUUM TYPE Early Methods of PreparingFilament. Following closely uponthe development of the tantalumlamp came the tungsten lamp.Tungsten possesses a very high melting point. An indirect methodwas originally employed in forming filaments for…
Electrical engineering
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