Show i J 7 1 i I 1 1 PA x H 1 I 1 I 1 I 1 i 11 i Z III wt 1 r W k 4 0 I 1 47 w A ft T I 1 j Y aai PW 6 I 1 i alj 10 i 14 1 w J I 1 i J 0 v 4 F V ib N 11 s I 1 I 1 ariu y 11 I 1 rl b t I 1 k j M 16 1 i at af n 4 r 1 1 1 1 M 4 g I 1 i R IR f 1 I 1 iha I 1 I n SA goal i aj 1 1 j lo 10 k A r ez 1 Y kv k V 1 f jr 04 1 I 1 dk n 19 sh sharply i Y 11 le y 0 I 1 1 I 1 I 1 defined beam like J 1 1 i P ligliN nickly NIi ol likely kly 11 p a 11 11 1 biar aa J H K Ch chiefa ra A laboratory at pry burtu f 4 A i N y I 1 athe th CO sue ot i baad I 1 I 1 I 1 11 capt I 1 up frequez frequently ta v gives MSG t to 0 T jim asto I 1 to th the e p possibilities os 1 I la other f ofia of radio dlo the wavea from V I 1 radio 1 ay iy et atton aba v 6 aila tural tendency I 1 ut in a all ia directions 4 broadcasting aa we we lifty havo s atway it lt today Way Is tha culmination of development of the 11 DO ot ordinary radio wavea avea 11 11 I 1 I 1 4 fiz 1 ron The aha early arl days day of radio li has 1 been it a goal of OC deleat the 11 c j I id and efforts to concentrate a beam lul of 1 cadlo waves tri th aile one direction like a the possibilities of in and dunavi of lavt 0 giitl onal i al aids iia control it if sucha such a thing ahin i could ba 0 79 4 otte 1 are I 1 ira my obvious we AN are BO SO accustomed cu to think I 1 anything radio hi dislike any tb of 44 i matij many efforts haitt been mada ae to pro ance ducer number of iiri vey things iiii being done V iab guib I 1 T properties ha as radio way 8 I 1 I 1 1 I I 1 1 I 1 Vork thus far the md directing 0 f to radio batea to a very abai beam ftp from i la li R uz ma likely to abt tid Ni never the lessl tho approximates tha iri being idof ii are of otery v i ery treat Ta value iiii about top teo years ago mar marconi coa di I 1 that biffie by the use t of 0 i a para bolle reflecting arran arrangement gemeni radio davs coald be part partially lilly diarist ed la in R desired direction tn n arrangement I 1 the intensity jo the wavea along duj the de desire aIre direction 6 a was several times that at angles great t er CT than 80 de degreed az as troia rion ithal thai direction with waves wates of th the 0 or order derot 0 S 2 to 1 10 meters ju jn lengthy a reflecting i arrange ment of practical alze can readily be constructed and the waves can be transmitted distances of several thou and iland miles from this beginning reflecting or ar of im improved types type s have baye been developed by american and other experimenters giving the evolution ol of the so ochilee beam byj etero tem abet bedig system has bis been adap adapted for practical we Us particularly byr jv great greaff britain beam stations are carryl carrying ig re regular jular radio between england and canada and other beam stations are being erected for with other parts of the british BrIt job empire in these stations wave lengths up no to as great as are used and the reflecting devices are very vary large straight rows of antennas instead of relying upon a parabolic arrangement of reflectors the currents in ln the varl vari aup w wires of the straight row have bev e their phases ma so adjusted as to reinforce radiation to n particular desired direction dirello ti and diminish it la in 0 other th erdi directions I 1 ions 4 11 I 1 N new iw 8 short hort waye I 1 I 1 k certain tb things i angs have bave veen been discovered in the realm of high frequencies bi or shore waves I 1 in 1 the h e I 1 las a 4 year air or I 1 wo which glye give renewed I 1 interest ferest In to tile the possibility of using beam methods for tomm between one point an and d another adoth er very short waves exhibit th the phenomenon of skip distance that I 1 Is beyond a short abort distance around the transmitting station there may be a zone oi of several hundred I 1 miles miles where aber the a signal ignal conn cannot ot be rec received elved and bt beyond this there will be another zone of a certain width where the signals tome come in very well I 1 if it now it were possible to td con confine one such ench waves wavea b larkly along p I 1 il a given line from the transmitting station the area where they could be bd received would be limited in two different directions ions and thus the signals from the transmitting station would be receivable at just one ona limited immite d area on the earths surface I 1 by suitable control of the wave lengths and ond times of transmission this my mastern stern would permit the putting of a 4 message down at any desired spot on I 1 the e earth arth the trouble 4 Is that beams can cannot inot be sent out any anywhere here nearly enough to accomplish this the drearr 0 of f radio nos aa a Me means ansof of I 1 URI ual and secret jeret communication between persons at any two desired destined places on the earth thus failes fades away it Is iq in the realm of navigational aids that directional radio lima has attained greatest success the direct directional io n findor finder Is a device now well known to ta mariners marinero Ma in its form it Is Ini merely a coll coil of wire which indicates the direction from which a radio waa I 1 Is coans ine merely rely by turning the coil and listening to tile the I 1 variation lai lation of the intensity af of the received I 1 this simple device h has almany amny uses py by virtue of ito lt complete cOmple teja lack afre of response t to 0 waves coming from a direction it at right ang angles es to the plans plane of the coll coil it can bemused be used to eliminate to in fr arpia any particular stam 1 tion donaa kian anzald ild to ocean navigation it Is 14 particularly vau valuable able under con durona off |