Radio mirror (Jan-Oct 1923)

r» :£<?' R ATE E IVrWl<^ JKJM3 V.IVimt YVAIV (Continued from page 1) bureau of identification and information in WaAington with Radio as the means for broadcasting data on criminals and their activities to the whole country. The report has been verified by William J. Burns, Chief of the Bureau of Investigaton. This national gallery of rogues and crime, the idea of the attorney general, is believed to be something unique in criminal investigation as it will cover the whole country and be immediately available. "In these days of preventative medicine, and fire and accident prevention," said Chief Investigator Burns, America's foremost detective, ' ' we have now come to crime prevention. We plan eventually to have on file in this bureau photographs, inger prints, descriptions and histories of every known criminal in America, as well as data on his methods of operation." First Real Crime Prevention Step When legislation authorizes it and the system gets into operation with state, county and municipal police departments co-operating, Mr. Burns believes the country will have made the first practical step toward the prevention of crime and the apprehension of criminals. If a local police department Radios to Washington the details of a crime, together With a description and name of the suspect, or asks for data on a man in the national rogues' gallery, the fugitive from justice can then be sure that a few minutes later his whole history will be broadcast throughout the United States. Within an hour after the commission of the crime he would be watched for at every possible point of departure. Mr. Burns believes this would greatly hinder tlie activity of criminals. Rogues' Archives in Preparation Already one police association has voted to turn over its criminal historical data to the Washington national headquarters, where the government records will be moved soon from. Leavenworth, Kansas, to form the nucleus of the criminal archives to be kept by the new division under Mr. Burns. Co-operation of all the states is anticipated as well as from all large cities where Radio broadcasting is in popular use. "A national bureau of identification will be of immense value to the country," Mr. Burns said, explaining that a criminal's psychology is such that when he is known, he is practically out of the game. "Turn the light on him, and he is destroyed," Mr. Burns couched it. "Catch him, without his knowing how it was accomplished," he said, "and he becomes uneasy and is ever thereafter slow to take a chance." Sir Basil Thomson, formerly head of Scotland Yard and a recent visitor in Washington, was most interested in the scheme, Mr. Burns said. Sir Basil is also a firm believer in the value of Radio in general police work. Eadio Greatest Achievement in. World "I believe Radio is the greatest scientific achievement in the history of the "World," declared the chief of the government's criminal investigation bureau. Within two years, he predicts every home, institution and establishment will be equipped with Radio receiving sets capable of receiving messages from all over the country and even abroad. In New York, he added, the police broadcast warnings from headquarters when a crime is committed and the criminal is yet at large. These messages are not onlypicked up by all stations but by a fleet of scouting automobiles. They immediately scatter or assemble, so as to cut off the escape of the criminal. The system is also in operation in Chicago, and is applicable everywhere. When asked if the criminals wouldn't get Radio sets and learn what the police were planning to do, Mr. Burns replied that it wouldn't do them any good, as they "couldn't dodge Radio broadcasts." FLEWELLING PRIZE CONTEST RULES 1. Contest is open to all Radiophans, whether or not they are subscribers to Radio Digest, Illustrated. The contest is open now and will close January 27 at midnight. Awards will be announced in the February 24 issue of this publication. 2. The ohject is to locate and award prizes on a competitive basis for the best Flewelling circuit receiving set entered. 3. Prizes are: First, $25.00; Second; $15.00; Third, $10.00; Fourth to Eighth (five prizes) inclusive, $5.00 each. A. In event of a tie, equal prizes will be awarded both contestants. 5. Judges will be the Technical Staff of Radio Digest, Illustrated. S. To enter the contest send working drawings and diagrams together with an article of from 1,500 to 2,500 words in length describing the making and operation of an actual Flewelling circuit receiving set. The contestant must build this set and test it before entering the contest. The article must tell: (a) how to make the set, (b) how to operate it, (c) helpful suggestions for getting maximum results, (d) actual airline broadcasting station receiving range using only one tube, first employing only an indoor aerial but no ground, second, using a ground but no aerial, and third, if available, using only a loop aerial. Other combinations and notations on the antenna system used will be considered in the award of prizes. 7. In sending material for consideration in the contest, exclusive publication rights are automatically given to Radio Digest, Illustrated. All articles published, but not awarded prizes, will be paid for at regular space rates. Unused manuscripts will be returned to contestants. 8. In deciding the winners of the contest the judges reserve the right to call for any set entered to be sent in for examination and test. Tubes. A and B batteries and phones will not be required in sets sent in for testing. 9. Manuscripts will be judged from the standpoints of neatness, clarity of expression, completeness, and actual tried success of the set described. W. Originality in the use of various parts of apparatus other than shown by! Radio Digest in the Flewelling circuit heretofore* is encouraged and even recommended. See Rule 6, however, for method to be used in determining the range. IMPROVE CHECK ON WEATHER BY RADIO MORE ACCURATE REPORTS BY FORECAST EXCHANGE U. S. to Get Observations from Canada, Mexico, Europe, Pacific Islands and Far East Radiophone Arrives in Denmark Washington, D. C. — The Radio telephone has arrived in Denmark, and experiments lately have been made with a view to bringing this method of communication to the attention of the public, according to a report from Consul General Letcher, at Copenhagen. The development of the Radio is being retarded, however, by laws forbidding the use of all amateur telephone and telegraph outfits. Many firms and institutions have endeavored to secure permission to operate sending and receiving stations but only certain schools, laboratories and educational institutions so far have been given the requisite authority and only for technical and educational purposes. It seems that nothing will be done until the proposed international conference on the regulations of Radio phone and telegraph communication, which will meet at Paris next month. CONTENTS Eadio Digest, Illustrated. Volume 4. Number 2, published Chicago, Illinois, Januaiy 20, 1923. Published weekly by Radio Digest Publishing Company. 123 West Madison Street, Chicago, Illinois. Subscription rates, yearly. Five Dollars; Foreign. Six Dollars. single eopies. Ten Cents. Entered as 6econd-class matter April 27. 1922, at the postoSflce at Chicago, Illinois, under the Act of March. 3 1879. "AD the Live News of Radio" . j~. ...; 1 to 6 Flewelling Prize Contest Rules 2 Receiving Records Contest 4 Air Waves Help Spread the Gospel— by Vera Brady Shipman ; S Explains federal R. F. Receiving Set — Book Reviews 6 Radio Receiving Sets— Federal DX Type 58, Radio Frequency Receiving— Photo Diagram 7 Radiophone Broadcasting Directory. Part III, Station Schedules from WLAS To WWZ 8-9 Editorials; Condensed by Dielectric; Indigest, Humor Column 10 A-B-C Lessons for Radio Beginners, by Arthur G. Mohaupt 11 Rectifier for Charging B Batteries; Electric Light System Used as Ground Tester; Four Other Kinks . ... 12 Three New Reflex Circuits— by Harry J. Marx ".."......!.'.'.'.'..".'.'. 13 Flewelling Circuit Shown as R.D.— 70; How to Make an Efficient Crystal Set for $6.00 14 Questions and Answers ....•••.. i^.-..' 15 Radio Illustrated — A Page of Pictures...-.-. .....ii.J_.....ix ,4 16 Looking Ahead WASHINGTON. — More accurate weather forecasting is to be made possible this year through international exchanges of reports by Radio, it was learned at the Depaxtment of Agriculture. "Arrangements have been made for exchanging observations from Canada, Mexico, 22 European countries, the Pacific Islands, and the Far East," said Charles F. Marvin, chief of the weather bureau. Government statistics show that forecasts both of weather and temperature have averaged better than 90 per cent accuracy for the past 10 years. The rapid development of the Radio in the past year has made increasing certainty possible. Radio Aids Disseminating Reports "Radio telegraphy as a medium for the dissemination of weather forecasts, warnings and information to agricultural interests," said Mr. Marvin, "became a realization during the past year. With the introduction of Radiophony the broadcasts ing of information over the interior has increased enormously." The introduction of Radiophony has made it possible for anyone to receive messages in spoken words instead of a code. A year ago the daily forecasts of the weather bureau were being broadcast from 12 Radio stations in only seven States, and principally by Radio telegraphy. On July L 1922, 98 stations in 35 States were broadcasting daily weather forecasts and warnings. Weather Bureau Has BTo Stations The weather bureau does not own or operate any Radio equipment. The distribution work is accomplished through plants operated by other government agencies, corporations and private individuals, and this without expense to the weather bureau. To avoid unnecessary crowding of air and interference with schedules, only two stations are licensed to broadcast in any city or community. Formerly many farmers were so located as to be inaccessible by newspapers or telegraph. Telephone lines extended into rural communities overcame some, but not all of this difficulty. To benefit by Radio telegraphy the code has to be learned. The marvelous advance in Radiophony has changed this situation, for thousands of farmers have installed receiving apparatus during the past year and are now obtaining forecasts and warnings easily and promptly. Air to Transmit Motion Pictures Time Is Near When We Will See a Movie at Home Answering Questions on Flewelling Circuit will be a feature of the January 27th issue of Radio Digest. Many of the difficulties encountered by experimenters • with this wizard circuit will be explained simply in this article. Don't mis3 the next number. Still More About Reflex Circuits will be given by Harry J. Marx, as a feature of the next issue. Many fans have reported good results with thesedouble duty circuits. You will want to study them because they promise unusual possibilities of reception. Sure buy the January 27th number. A-B-C Lessons for Radio Beginners, Chapter IV, in January 27th Digest, will give many interesting facts for the new and old fans. These articles by Arthur G. Mohaupt are proving popular because of their simplicity. Better order your copy from your newsstand today. The Eighteenth Photo Diagram of the Standard Receiving Sets shown only by the Digest will appear next week. The Aeriala will be explained clearly in photo diagram. You'll want to see this one because of its simplicity. Story of a Well Known Broadcasting Station, will be part of the Digest nest issue. A human interest tale of a station you have heard. Guess which one? ftl^o^a^g/the PubU^HeaTthJ Tl» 0»fr °_ne Suref«« Broadcasting Schedule will be published as usual with part announces that since its inaugura-j one m January L 7th number. Many corrections have been made. Keep your list up-to-date. This service is original with Radio Digest, Imitation is the sin cerest form of flattery. GROWTH OF PUBLIC HEALTH SERVICE First Anniversary of Broadcasting Since It Was Inaugurated at NOF WASHINGTON. — On the first anniversary of Service tion on NOF, the service has grown, until today ten stations in nine states and one in Canada, are carrying its educational talks. It is unique, in that it is the only national Radio health service in the world. Its messages are not only heard by thousands, but are being used extensively in the foreign language press in both America and Europe. For the first time a call is being made for replies from listeners in to determine exactly how extensive is its scope and how its broadcasts are received. A Radio club is being organized in Seattle, its members being amateurs who desire to become proficient in Radio telegraphy. The club proposes to establish a broadcasting station, to open a bureau for information on all Radio subjects and to undertake experimentation in the field of Radio. Newsstands Don't Always Have One Left WHEN YOU WANT Radio Digest YOU WANT IT! BE SURE OF YOUR WEEKLY COPY BY SUBSCRIBING NOW SEND IN THE BLANK TODAY Publisher, 4.2 Radio Digest. Illustrated. 123 West Madison St., Chir-ago, Illinois. Please And enclosed check HI. 0. for Five Dollars (Six, Foreign) for One Year's Subscription to Radio Digest, Illustrated. Will moving pictures be transmitted by Radio? Will an event that is happening on one side of the world be reproduced simultaneously on the other side? Back of these questions there lies one of the most astounding possibilities of the immediate future. The thought has not been conjured up by some imaginative brain, but as a matter of fact is based on some very careful experiments which show remarkable promise of success within a shorter time than is really popularly believed. We are all more or less familiar in a general way with the fact that photographs can be transmitted over distances by means of telegraph lines, and even through the instrumentality of Radio. In this case, however, we need the invention of a camera to take the photograph in the first place. Moreover, the photographic plate has to be developed and a print made before the photo-telegraphic process can be put into operation. Hungarian Performs Remarkable Results The new art involves the transmission of a complete vision just as it is occurring at some distant point. In this connection some remarkable experiments have just been concluded by Nicholas Langer, a Hungarian scientist, who has probably produced the rudiments of a successful system. Although the practical development of this may take several years, there is no question that an auspicious start has been made. His own views, after outlining the difficulties that will have to be overcome, were expressed in the following words: "Personally, I look forward with confidence to the time when we shall not only speak with, but also see, those with whom we carry on telephone or Radiophone conversations, and the distribution of motion picture films will be superseded by the direct transmission from a central studio."