Word: carbons
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Dates: during 1880-1889
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...more powerful machines are called "Series machines," in which the current from the dynamo is strengthened by passing through all the large coil of its electric-magnet. The ordinary are light is made by breaking the outside circuit of a Series machine. The carbon tips must be together when the current is started, and the break is made by lifting the upper one a little by a mechanical arrangement. The powerful current, in overcoming the resistance offered by the air, heats the carbon tips to a white heat. In the incandescent lamp the resistance is offered by a filament...
Copying at 3 cents per hundred words only when paper is furnished and the copying is done by hand and at leisure. Type-writing 5 or 6 cents per hundred words; one or two carbon duplicates at half price...
Copying at 3 cents per hundred words only when paper is furnished and the copying is done by hand and at leisure. Type-writing 5 or 6 cents per hundred words; one or two carbon duplicates at half price...
Copying at 3 cents per hundred words only when paper is furnished and the copying is done by hand and at leisure. Type-writing 5 or 6 cents per hundred words; one or two carbon duplicates at half price...
Copying at 3 cents per hundred words only when paper is furnished and the copying is done by hand and at leisure. Type-writing 5 or 6 cents per hundred words; one or two carbon duplicates at half price...