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Show H RADIO WAVES II SENT IN BEAM Invention of Reflector of B Great Strength and Clear - M ness Announced P NEW YORK. June 21 Senator Jgj Guglielmo Marconi, wonder man of h wireless, Tuesday announced the ln- M vention of what might be termed a M r.idio searchlight by mean of which m radio wave?, which can be flecte I m like light waves, may be Bent . in a, 43 Klven direction in a beam. Instead of m being BCattered to all points of the rral compass. I The famous Italian Bald bo believ.-, IS. ed this Invention could be utilised In m uch ; manner as to rid the sea of ; $3 somP of its terrors, for with a re-S3 re-S3 xuUing reflector, the transmitter: would constitute a radio lighthouse. XM capable of flahinc suldimr beams! TSSa1 nearly a hundred miles, M I OK USE in fogs H i Addressing r Joint meeting of the Institute of Radio Engineers and the H nierican Institute of Ele. trlcal Bn- I slneers on his latest discoveries, the inventor s.;ld of the proposed radio -s3 lighthouse: "By means ol the revolving beam Hfl of electrical radiation, it is possible -3 for ships, when within B certain i Hfl lance to ascertain in thi k weather. the bearing and position ol ihe ligh.- house. . . v. "It seems to me that It should be; possible to design apparatus by means of which a ship could radiate fl project a dlvergement beam ol lhs short wave rays in any desired direc-H direc-H lion, which rays, if coming across H ;t metallic object, such as another I steamer would be reflected back 10 H a receiver on the sending ship and 1 thereby immediately reveal the pres- .1 , n( b and bearing of the other ship :n a fog or thick weather, une further t' t?reat advantage of BUI h an ai r I g - f'M ment would be that it wou d be able to give warning of the presence and; .'M bearinf? of ships even should these vjr ships he unprovided with any kind of t?j radio." 3 REFLECTORS IMjUSTRATKD. Marconi's radio searchlight little resemblance to the battleship H searchlights. U is rather n Bpc m T,f arrangement of wires n towers masts - During his lectur Marconi exhlb- Hj itod pictures of reflectors, resembling the weird apparatus pictured in mag-I mag-I inary tales of the conquest of the' J world by Martians. Through the us Hi of these reflectors at both ends, cle RH speech was exchanged during 99; ments over a distance of 99 miles iK between London and Birmingham he .announced, establishing a record in 9 long distance radio transmission and Ha reception with shon waves, fifi Marconi stated th.ir Ihe reflector WM make it possible for the receiver I reproduce a radio telephone song or BSi speech about hi hi tim-s louder than Is ordinarily possible IVhat is more, W speech is transmitted ua ti- H without distortion and the ir.ansni1- RS ting aerial can be used both for B8 sending and receiving at the - ime H time. M SHORT WAVES NEGLECTED. B9 "In these das of broadcasting, it BjB may still prove to bo very useful ii Bfl have a practically new system which BM will bo to a very large degree secret Bt when compared to the usual kind of. B9 radio," he added. BS Marconi expressed belief thai in HB the development of r.idio comli'.m- SB lion, the longer wave lengths have so RBJ much absorbed the attention BB ventors and engineers thai the time has come to conduct research in short v.jU' length radio. Of around-the-world wireless, he said, he had obtained results ' whl iti go far to show the relative facility with which radio signals can now lv sent from England to Australia and Seem to indicate that there something some-thing in the idea of the wireless waves traveling around the earth by va-ricTus va-ricTus ways and reuniting at the Antipodes." An-tipodes." rESTS AUTO IGNITION. Sometimes these radio waves, tra'-elm tra'-elm the earth in different direction, reinforce each other when ihey meet ., the receiver said Marconi, and sometimes they interfere with each Other. He declared that the groat stalion built py tho Radio corporation corpora-tion of America it port Jefferson. Long Island the most powerful on thla continent, sent waves that 'pre- ; 1 forred to travel three quarters of tho way around the earth, rather than to come by the shortest way round ' Marconi discovered that when short waes are used disturbances caused by static onn be said to be , "almost nonexlstlng and tho only , interference comes from the ignition apparatus of automobiles and motor- j boats." "incidentally," ho added. "I might I mention that one of these short wave ' receivers will act as an accurate device for testing whether or not .i s ignition sstem is working ill right. Some motorists would have s, shock If they realized how often . their Ignitos and spark plugs are I working In a deplorable, Irregular ' manner." TO () Kitl tlMK STATU To overcome static, Marconi first deternilnes the strength of the signal sent bj 1 measuring apparatus and then makes the signal strength erual to that of the distant transmitting Bl ition , "If th" signals are unreadable, due I to static." Mr. Marconi explained, "the measuring apparatus is used to rend to an operator at a standard rate of 20 words per minute, five letter let-ter code, ml the voltage applied to aerial from the local sender Is Increased In-creased until complete readability Is obtained.' Thus, Marconi s aid. he obtained "at once a very correst es- timatc of how much power was needed need-ed to drive the signal through." Marconi has discovered that a certain cer-tain kind of static cnllefi "grinder " originates over Africa and another violent "Hick" type over smooth Am-eric Am-eric a. |
