Show prepared by the united stief department of agriculture there are nearly radio sets on farms in the united states the department part ment of agriculture estimates in a report on the growth of farm radio during the past five years in some states the department says there are radio sets on 25 to 40 per cent of all farms estimates made by the department in 1023 showed sets in use on farms at that time sets in 1924 and sets early in 1925 increased power and improved broadcasting together with better re sets the department believes will do much to aid in establishing the permanency of the use of radio for the benefit of agriculture one station alone in a period of three months broadcasting of market and weather reports received more than letters of commendation from farmers country banks shippers of live stock and mall merchants in the towns in 12 agricultural states surrounding the station interference among stations gradually be eliminated the department believes as many of the less active stations are being discontinued and technical improvements are being made in both broadcasting and ing equipment of 1458 radio sta alons of all sizes licensed to broadcast since broadcasting began only were active on january 1 this year co operative arrangements the department has made co opera alve arrangements with more than stations or broadcasting official mar ket news gathered by department representatives in leading shipping and consuming areas since the first of the year the department has made ar range ments with about GO stations to broadcast on a regular schedule four additional services dealing with general agricultural information literally hundreds of stations have requested the privilege 0 handling the government reports but many of the requests have had to be refused the department says because the stations are remote from the departments mar ket news branch offices when the experimental radio market news service was announced on december 21 1920 the report states those in the department of agriculture who were directing the new ac hardly anticipated the wonderful possibilities of radio broadcasting as we now enow it A labon tory transmitter at the united states bu reau of standards on a meter wave length a few enthusiastic amateurs within a hundred miles of washington and a 5 p m schedule of about words by radio telegraph composing what was called the radio marlet gram constituted the elements of the experiment the practical results of this first experiment could hardly be called conclusive clu sive but they gave encouragement to those in charge of it the to push on in quest of more and more evidence on april 7 1921 an announcement was made that arrangements had been completed with the airmail radio service of the post office department to transmit by wireless marlat ports several re 1 times a day from office post stations at washington bellefonte Belle fonte pa st D 0 bouts louts omaha mo and amateurs were enlisted assuming an effective radius of au of miles alon licensed about each sta amateurs in the covered areas were enlisted to copy the and to furnish reports them to shippers associations beaus of markets county agents state bu other agricultural farm bureaus and 1 agencies banks newspapers and local telephone A exchanges number of licensed acors offered to oper copy the january 1 1022 the reports by were being market reports related and radio broadcast telegraph from by stations in a chain seven post office across the country to dalas three of 1921 the then were furnished telephone broadcasting very few radio then the has stations since grown by haapa and bounds until now there Is no agricultural community the country that Is without obi market reports on agricultural va modifies well established sched ii of weather crop and market reec are broadcast from more than ft bons in all parts of the country farmers of necessity the ment says have bought mainly li priced sets capable of getting filitia stations the average cost of rail sets on more than 1000 farms si ab scattered over the country estimated by the department at 1 l better and more easily operated efra ment can be bought now for halts amount the department says an authentic list of broadcastings alons the country oer that broader market and crop reports has be prepared by the department tor t distribution requests for the should be mailed to the burvant agricultural economics united stia department of agriculture wasl ton D C r huuki forefathers OF RADIO 1 by GEORGE LEWIS of the croler ilailo developments in radio went ahead by leaps and bounds t f the reception of signals was chamiw by the lack of proper means for t them many men worked v g this problem J A fiella for 1 stance invented the valve aa was the forerunner of the radio ty developed by deforest in this coane y but the detecting device which V came n ost popular in the early to of radio waa the crystal detector g developed by denwoody and pia and introduced in by means the crystal detector the received u J A fleming ahli trie current Is so modified that tt operate a telephone receiver up to athla time there had t few radio stations that there was difficulty about the signals ol 01 w y than one station being irai same time and interfering another however no wever such dl were anticipated by other J which overcame them pi the length of waves sent 0 lo 10 the transmitting station dc penda certain constants of the just na the length of a water W cependa upon the object which tv 6 the disturbance in the water and e for the waves thus aff dropped into a pond will sera i little short choppy wave big ocean liner overturns he w u it makes will be followed bif t of great length dy aua certain parts of the transmitting ratus the length of wave that it t is out may be controlled and by ing similar parts of the decew w i one may control the length to which it will 1 I Is called tuning w thus very early in the bl 1 l adlo transmitting stations DC iu ither were tuned to different lengths so that the operator 01 elving set could tune to nt 1 H alem L |