Abstract
It will be seen that the development and use of vacuum tube apparatus by commercial and government stations has not only doubled the range of marine communications, but at the same time has made it possible to carry on a more extensive service with a far smaller number of corresponding stations on shore. Due to the much sharper waves emitted by vacuum tube transmitters, a greater number of channels have been opened for marine communications, which has resulted in the development of multiplex stations where marine activities are concentrated. Discontinuance of the use of spark apparatus at coast stations. and to a large extent on shipboard, has almost totally eliminated the interference formerly caused by spark stations.
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