. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. BADIOTELEGEAPHY MARCONI. 123 machinery need be used for operating the station, with the single exception of the small motor revolving the disk. The potential to which the condenser is charged reaches 18,000 volts when that of the batteiy or generators is 12,000. This poten- tial is obtained in consequence of the rise of potential at the con- denser plates, brought about by the rush of current through the choking or mductance coils at each c
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. BADIOTELEGEAPHY MARCONI. 123 machinery need be used for operating the station, with the single exception of the small motor revolving the disk. The potential to which the condenser is charged reaches 18,000 volts when that of the batteiy or generators is 12,000. This poten- tial is obtained in consequence of the rise of potential at the con- denser plates, brought about by the rush of current through the choking or mductance coils at each charge. These coils are placed between the battery or generator and the condenser c, figure 6. No practical difficulty has been encountered either at Clifden or Glace Bay in regard to the insulation and maintenance of these high- tension storage batteries. Satisfactory insulation has been obtained by dividing the battery into small sets of cells placed on separate stands. These stands are suspended on insulators attached to girders fixed in the ceiling of the battery room. A system of switches, which can all be operated electrically and simultaneously, divides the battery into sections, the potential of each section bemg low enough to enable the cells to be handled without inconvenience or risk. The arrangement of aerial adopted at Clifden and Glace Bay is shown in figure 7. This system, which is based on the result of tests which I first de- scribed before the Royal Society in June, 1906,^ not only makes it pos- sible to efficiently . Fig. 7. radiate and receive waves of any desired length, but it also tends to confine the main portion of the radiation to any desired direction. The limitation of transmission to one direction is not very sharply defined, but nevertheless the results obtained are exceedingly useful for practical working. In a similar manner, by means of these horizontal wires, it is possible to define the bearing or direction of a sending station, and also lunit
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