 | American School (Chicago, Ill.) - Engineering - 1903 - 488 pages
...telephone off the hook. This lamp is put out when the operator answers the call. This battery also is made in duplicate, one being charged while the...out the lamp from the higher voltage during charge. Storage Batteries for Train Illumination. When cars are lighted by oil or gas lamps, these, owing to... | |
 | American School (Lansing, Ill.) - Electricity - 1903 - 320 pages
...telephone off the hook. This lamp is put out when the operator answers the call. This battery also is made in duplicate, one being charged while the...out the lamp from the higher voltage during charge. Storage Batteries for Train Illumination. When cars are lighted by oil or gas lamps, these, owing to... | |
 | Electrical engineering - 1905 - 492 pages
...telephone off the hook. This lamp is put out when the operator answers the call. This battery also is made in duplicate, one being charged while the...out the lamp from the higher voltage during charge. Storage Batteries for Train Illumination. When cars are .lighted by oil or gas lamps, these, owing... | |
 | Electrical engineering - 1906 - 590 pages
...telephone off the hook. This lamp is put out, when the operator answers the call. This battery also is made in duplicate, one being charged while the...out the lamp from the higher voltage during charge. Storage Batteries for Train Illumination. When cars are lighted by oil or gas lamps, these, owing to... | |
 | Electric engineering - 1913 - 452 pages
...telephone off the hook. This lamp is put out when the operator answers the call. This battery also is made in duplicate, one being charged while the...out the lamp from the higher voltage during charge. Storage Batteries for Train Illumination. When cars are lighted by oil or gas lamps, these, owing to... | |
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... transmitters. The latter is arranged to furnish a current of four volts or two volts as desired. The 4-volt battery also furnishes all current for the lamp signals which light when a subscriber takes his telephone off the hook. This lamp is put out... 