WIRELESS TELEPHONY

Manawatu Herald, Volume XLIII, Issue 2253, 19 March 1921, Page 1

WIRELESS TELEPHONY

Mr Mareoui has boon engaged for >ome time on experiments in wireless telephony, which he believes promise "Teat possibilities in the near future. Recently he succeeded in speaking with ease from his yacht at Naples to Chelmsford. Very soon wireless telephonic messages will lie praetieable between London and Paris. Already a few words have been exchanged between Europe and America, and, although a public, service across the Atlantic is still a question of the future, Mr Marconi considers that it ought not to be a very long time before it is established. While recognising the difficulties in the way of further development in wireless telephony, he does not regard them as insurmountable. One problem is that of handling large plants. Considerable development is going on in the application and utilisation of continuous waves and in the elimination of interference between slalons, which is one of the great difficulties of wireless work. Another important consideration, from the point of view of making wireless telephony a commercial proposition, is the reduction of the capital cost of: the necessary stations and equipment without sacrifice of efficiency. In this direction Mr Marconi has made a remarkable advance. He is now able greatly to reduce the height of the masts and towers, which at an earlier stage had to he very talk With an 80ft. mast and an apparatus of small power he has been able to speak over distances up to 1,000 miles. The utility of wireless telephony, Mr Marconi thinks, is likely to be confined for some time to long-distance - work. The difficulty of applying it to shojt distances is that of preventing a great number of communications from interfering with one another. For the present his own researches are mostly concerned with devices designed to aid navigation at sea. He has been working devices on his yaclil which are intended to prevent collisions and to render navigation safer and easier in foggy and thick weather. Similar researches are also in progress to help pilots of aeroplanes and airships in conditions where they are deprived of sunlight to judge their exact position.

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