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Phoning Home from Mid-Ocean
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almost any band of wavelengths and it is only necessary to have the transmitting wavelength of sufficient difference from the receiving wavelength to be resisted by this trap or filter.
Obviously, this arrangement provides a substitute for the send-receive switch, as the operator may speak into his transmitter and control the powerful antenna currents while he listens to the feeble signals arriving at his receiving set.
He may thus be interrupted while speaking by the man at the distant station who may wish him to repeat part of his message. Thus, interchange of thought is as instantaneous as with the ordinary land telephone.
This method was given a series of preliminary tests before the installation was finally made on the S. S. America. That it was the proper method of procedure was then well established. The tests aboard the ship were made as a means of determining the commercial worth of the system, and the accuracy with which this work was performed was well demonstrated by the remarkably successful trials at sea.
On her first and subsequent voyages and under normal atmospheric conditions, reliable telephone communication with the shore was established while the ship was more than 1,600 miles from New York. Both Captain Rind of the America and the shore operator reported the speech to be perfectly intelligible at all times during many conversations which they held while the ship was in mid-ocean. Incidentally, many amateurs located on the Atlantic seaboard listened-in and were thrilled by these remarkable experiments.
SHORE APPLICATION
THE duplex system was now an accomplished fact, but why should its application be limited to the service of the Captain of the America and the operator at the shore station? To render the maximum amount of service, the "ether line" between the America and the shore must be linked up with the regular wire telephone systems of the country, so that a business man, for instance, located anv
THE RADIO ROOM ON THE S. S. "AMERICA" Through the complex circuits in this room incoming and outgoing voice currents pass simultaneously