WIRELESS TELEPHONY

Nelson Evening Mail, Volume LIV, 21 March 1921, Page 5

WIRELESS TELEPHONY

GREAT POSSIBILITIES IN NEAR FUTURE ■ Mr Marconi has been.. engaged for 'some 'tittle on experiments.; iji wireless telephony which .'he.,s£li'eves \ promise great .possibilities in the' near future. Recently^he succeeded in speaking with ease from his yacht at Naples tp Chelmsford. Very soon wireless telephonic messages will be practicable between London &m Paris. AJready a few words fi&fi been exchanged between Eurbp? and America, and, public' service across the .Atlantic is still ,a- question of. the jir Marctai ..considers that ;,. it pught: not .td be a very long time befbre it, h established. While ; recognising the dif&'cultlfejs in jthe way of furthers development in wireless telephony, he does pot re'gard them as .insurmountjible. One. problem is that of handling large plants. Considerable ; development is going _on in the application and utilisation J>i continuous waves and in the e)ir minatipn of interference between stations, which is one of the gre£,t difficulties of wireless worjk Another important eoru3i:deratipta ? ■ from the point o! ,yiew of niakmg ! wireless .telephony a commercial proposition, is the reduction ; of jthe capital cost of. stations and .equipment .without sacrifice of efjiciency. In .this--direction Mr. Marconi has made a remarkable advance, -.:, S'e te • flow table greatly to .reduce heightof the masts, a^ollowers; which, at an earlier to be, very • tall, With ah 80ft. mast andean apparatus of small po-wer he has been able to speak oyer distances "up to 1000 miles. The- utility of wireless telephony, Mr Marcohj thinks; is likely to be confined for some time,. ,to ■,.. work. The difficulty of. applying it to short dishes ,is J^t, of preventing, a great number ~ot communications.... from.. interfering with one another....,. For the present his own researches are,&ss- - concerned with devices designed to aid navigation at, sea. fie has been worklhg devices yacht which are intended to pre; vent .collisions andl. naviga!tion safer and , easier; in foggy and thick weather. Similar researches are also in progress; *0 help pilots of .aeroplanes and airships in conditions where .they are deprived of sunlight to. judge their exact position.