. Practical wireless telegraphy; a complete text book for students of radio communication . ircuits, No. 4 and No. 5, have been grouped together. Beginningwith the Bolinas station, the transmitter is of 300 K. W. capacity, current for its operationbeing supplied by duplicate 500 H. P. steam turbine driven generators delivering current at180 cycles per second. In the usual manner, this current is stepped up by closed core trans-formers to approximately 50,000 volts and employed to charge a bank of high voltage oilplate condensers. Although normally operated at from 75 to 150 K. W. the full 300
. Practical wireless telegraphy; a complete text book for students of radio communication . ircuits, No. 4 and No. 5, have been grouped together. Beginningwith the Bolinas station, the transmitter is of 300 K. W. capacity, current for its operationbeing supplied by duplicate 500 H. P. steam turbine driven generators delivering current at180 cycles per second. In the usual manner, this current is stepped up by closed core trans-formers to approximately 50,000 volts and employed to charge a bank of high voltage oilplate condensers. Although normally operated at from 75 to 150 K. W. the full 300 K. be employed whenever necessary. The aerial for receiving from Bolinas, Cal., is nearly a mile in length erected on tworows of tubular steel masts in the usual manner. The receiving aerial at Marshalls, Cali-fornia, has 7 masts, each of which are 330 feet in height. The receiving station at Koko Head, Hawaiian Islands, has two distinct receiving aerials,together with balancing out aerials, one being employed for reception from Bolinas, Calif.,and the other from Funabashi, Fig. 307—Bank of High Voltage Trans-formers at Carnarvon Station. Fig. 308—The Switchboard of the New BrunswickHigh Power Transoceanic Station. The aerial for receiving from Bolinas extends southwestward from the operatmg_houseand is carried on five 330 feet masts to an anchorage on the beach. The aenal forreception from Japan extends from the operating room almost due east. 1 he firsttwo masts for this aerial are of the standard sectional type 430 feet m height; the first is onlevel ground and the second is on the hillside. From this point the ^aerial makes a long spanof over 2,000 feet to the top edge of Koko Head (an extinct volcano) at an elevation of 1,194ittt above the sea level; here there is not enough room to erect a sectional mast, only about 40square feet being available for a self-supporting structural tower 150 eet m height. The tailend anchorage for this aerial is far down the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
