Radio Telephony, Alfred N. Goldsmith, 1918, pages 241-242 :
(d) FUTURE DEVELOPMENT OF RADIO TELEPHONY.
Now that the need for radio telephony is well recognized, we may confidently expect a very rapid development. Once a public demand is created, the technical advances required to satisfy that need must shortly follow.
Some interesting possibilities as to universal communication may be considered. So far as portable transmitters are concerned, it is unlikely for some time to come that a man will be able to carry a radiophone set capable of communicating more than a few miles. Some new motive force, the apparatus for producing which has a very small weight per kilowatt delivered, must first be discovered. So far as reception is concerned, however, very sensitive and light receiving apparatus, capable of receiving messages from hundreds (or even thousands) of miles is imaginable. So that it should become ultimately possible to keep in immediate touch with the traveling individual regardless of his motion or temporary location. A great field of usefulness is thus opened to development.
The linking of the wire telephone and radiophone systems of a country will go far toward making it possible for travelers to keep in touch with their homes and business at all times, and for the people of one nation to know the people of far distant nations in a close and intimate fashion. By the use of a deferred or night radiophone service (analogous to the day letter or night letter of the wire telegraph companies), reasonably inexpensive communication of this type should become feasible since such service might be rendered at times of light load and would tend to maintain the steady usefulness of the station. As is well known, stations are most efficiently operated when the load is nearly always full and constant. Plant efficiency requires, therefore, that some sort of premium be put on utilization of the plant facilities at times of normally light load.
In conclusion, it may be stated that it is certain that radio telephony, properly fostered by the Governments of the world, must become ever more useful to humanity. From ship and shore stations, from aeroplane and ground, from trains and depots, over forests and deserts, across oceans and continents will pass the spoken word of man. We may justly paraphrase President Elliot's splendid eulogy of another type of communication. His words apply with multiplied force to the radiophone of the future. We may rightly term this instrument for speeding the voice of man across space as:---
CARRIER OF NEWS AND KNOWLEDGE.
INSTRUMENT OF TRADE AND INDUSTRY.
PROTECTOR OF LIFE AT SEA.
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MESSENGER OF SYMPATHY AND LOVE.
SERVANT OF PARTED FRIENDS.
CONSOLER OF THE LONELY.
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BOND OF THE SCATTERED FAMILY.
ENLARGER OF THE COMMON LIFE.
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PROMOTER OF MUTUAL ACQUAINTANCE.
OF PEACE AND GOOD WILL AMONG MEN AND NATIONS..