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This pressure is generated by a steam-driven alternating-current generator and is transmitted over the conductors to sub-stations, where by means of step-down transformers, the pressure is dropped to, say, 600 volts alternating current which by rotary converters is turned into direct current for the street mains, for feeders of railways and for charging storage batteries which in turn give out direct current at times of heavy demand.
"Driven from the Pongo Regions northwest of Sierra Leone, Pedro Blanco settled in the Gallinhas territory northwest of the Liberian frontier, and established elaborate headquarters for his mammoth slave-trading operations in West Africa, with slave-trading sub-stations at Cape Mount, St.
His next inventive step covered the division of a large city district into a number of small sub-stations supplying current through an interconnected network of conductors, thus reducing expenditure for copper to some extent, because each distribution unit was small and limited the drop.
From sub-stations constantly engaged in checking back thumb-marks and numbers, an incessant stream of information would come, of births, of deaths, of arrivals at inns, of applications to post-offices for letters, of tickets taken for long journeys, of criminal convictions, marriages, applications for public doles and the like.
If Miss Brokaw was not with her father, he would take Gregson fully into his confidence. The next morning he despatched a messenger with a letter for MacDougall, at Blind Indian Lake, warning him to be on his guard and to prepare the long line of sub-stations for possible attack. All this day Gregson remained in the cabin. "It won't do for me to make myself too evident," he explained.
The Grand Army men have made the Adams Street Relief Station a central relief station and all the others at Kernville, the Pennsylvania depot, Cambria City and Jackson and Somerset Streets, sub-stations. The idea is to distribute supplies to the sub-stations from the central station and thus avoid the jam of crying and excited people at the committee's headquarters.
At the central office, in Paris, exists a well organized "boiler-plate" service for general Catholic news and opinions. These "boiler-plates" are shipped to all the sub-stations, where, during the week are composed the pages of local news, editorials, advertisements, etc. This is the most economical and most efficient modern method of publishing several papers or different issues of the one paper.
"This document," he remarked, turning to Mr. Hume, "is not in order. It has not been visaed by the officers at the sub-stations." "But it was initialed by your superior at the coast." "It must go back to the sub-stations for endorsement." Mr. Hume put a restraint on his temper. "And how long will that take?" "Who knows? Perhaps a month." "And in the mean time?"
All of these have become standard practice and are operated at the usual voltage of from 500 to 600 volts. The current on lines of any considerable length is alternating current, supplied from large central generating stations and transformed to direct as occasion may demand at suitable sub-stations.
"I see." Mr. Hume saw that these gentlemen wished to make money out of him. "Very good. I will myself go to the sub-stations by your special transport, and if the Governor says the charge is reasonable, I will pay on my return. I think that will meet the matter."
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