Alteneck’s Dynamo with “Drum” Wound Armature, 1872.
The armature winding was entirely on the surface of the armature core, a principle now used in all dynamos.
Von Hefner Alteneck, an engineer with Siemens, invented the drum wound armature in 1872. The wires of the armature were all on the surface of the armature core, the wires being tapped at frequent points for connection with the commutator bars. Thus in the early seventies, commercial dynamos were available for use in arc lighting, and a few installations were made in Europe.
RUSSIAN INCANDESCENT LAMP INVENTORS
In 1872 Lodyguine, a Russian scientist, made an incandescent lamp consisting of a “V” shaped piece of graphite for a burner, which operated in nitrogen gas. He lighted the Admiralty Dockyard at St. Petersburg with about two hundred of these lamps. In 1872 the Russian Academy of Sciences awarded him a prize of 50,000 rubles (a lot of real money at that time) for his invention. A company with a capital of 200,000 rubles (then equal to about $100,000) was formed but as the lamp was so expensive to operate and had such a short life, about twelve hours, the project failed.
Lodyguine’s Incandescent Lamp, 1872.
The burner was made of graphite and operated in nitrogen gas.
Konn’s Incandescent Lamp, 1875.