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Show THE SAUNA SUN. SAIJNA. UTAH Mine Laying Practice by the Coast Artillery (Copy for This Department Supplied by the American Legion News Servlos.) JAMES F. BARTON ASSUMES NEW JOB Circuit of Browning Drake Receiver. A Regeneration and Radio Frequency The radio public has been Introduced to hundreds of receiving sets and circuits during the past year or two. Some of them have been new but most of them have employed old principles and ideas revamped to look like In some cases something different. the new arrangement of circuits have been improvements while in others nothing worth while has been accomplished other than to make slight changes in order to attach trade names to old circuits. It is the exception rather than the rule when a circuit is designed and given to the public that really has an advantage over older methods. Manufacturers and designers for some time have been working toward the neutrodyne and away from the reThis has been due to the generative. fact that the neutrodyne is an exceptionally good radio frequency amplifier and the regenerative, of the popular type, has several objectionable features. The trend along this line was so great for a while that there was an organized effort made to condemn the regenerative set as a public nuisance. Time, however, has brought a reaction and the public has begun to realize that a good regenerative is hard to beat. Engineers likewise are almost ready to admit that a receiver does not amount to much unless la uses ' 6ome form of regeneration. Eliminates Radiation. The Browning Drake receiver employs one stage of neutralized radio frequency amplification, detector and two stages of audio amplification. The stage of radio amplification strengthens the radio frequency signals before they get to the detector and permits very sharp tuning. The detector with regeneration gives all the advantages of the old regenerative without radiation, which is the worst of the defects of the old receivers of this type. The circuit of the Browning Drake receiver is given in the accompanying drawing. The two main features of the receiver are the antenna tuning Inductance and the radio frequency amplifying transformer that works Into the detector tube. The latter is made of three inductances, the primary, secondary and tickler, and is called a to differentiate It from the ordinary transformer. consists The antenna inductance of 50 turns of No. 20 double silk or L-- 0 wire wound on a three-inc- h tube. A tap Is taken off at the center of this coil A-- 2 so that when the set Is used with a long antenna It can be compensated for by using only half of the coil. When a short antenna is used It Is attached to the top of the If neither of antenna Inductance A-- l. these connections are found to be appropriate for the antenna further vibrations in the circuit can be made by placing fixed condensers in series wlth the antenna. The regenoformer .consists of three windings. The secondary is made of 60 turns of No. 20 d wire double cotton or tube. The tube wound on a three-inc- h should be long enough to allow for the mounting of the tickler. One tap is taken off of the secondary coil. This is at the fourteenth turn counting from the end opposite the tickler, and is used for neutralizing the tube capacity. The primary L-- l consists of 24 turns of No. 30 D S or C C wire, wound jumble inch deep fashion in a slot one-hainch wide on the outand side edge of a wooden disk that will fit snugly Into one end of the tubing that supports the secondary winding. This coil should be placed at the low potential end of the secondary, the lead of which goes to the A battery. The tickler is of the common type, 30 turns of No. 20 D S or C C wire wound on a tube two Inches in diameter. This is mounted on a rod that passes through two holes In the tubing that holds the secondary coil. It is placed at the high potential end of the secondary the lead of which Is connected to the grid condenser and leak. Care In Mounting. When mounting the antenna coil and regenoformer care should be taken to place them at right angles to each other. This eliminates or reduces to a minimum coupling between the two circuits and prevents any feed back between them. In the standard parts made for this receiver the coils are mounted on the backs of the two variable condensers. 201-or li 9 tubes can be used. In the circuit shown a 11)9 tube Is used as the radio frequency amplifier and 201-A- s for the detector and audio amplifiers. The 199 is practically as as a radio frequency good as a 201-amplifier arid is somewhat more easily neutralized. The larger tubes give more volume than 199g when used as cotton-covere- d Four-Tub- e Set With Amplification. detectors or audio amplifiers and for that reason are recommended in these e positions in the Browning Drake receiver. An amperite of the right value for a is used in series with the filament of the first tube. A rheostat permits the control of the current to the filament of the second tube and a rheostat Is connected in the negative filament lead to four-tub- 199-tub- e 30-oh- 20-oh- the two audio amplifiers. Two amper-ite-s can be used in place of the rheostat if one wishes to reduce the number of controls to a minimum. The values of the various condensers, the remainder of the instruments and the correct connections are shown plainly on the diagram. Those who have built receivers of this type are very high in their praise of the efficiency of the circuit The four tubes give a greater amount of amplification than is obtainable with e set having two stages of a radio amplification. Regeneration in the detector of the Browning Drake set affords much greater amplification than one stage of straight radio freOne tube has quency amplification. therefore been eliminated, and by the use of one 199 tube the current drain on the A" battery has been reduced materially. This receiver will be of particular interest to those who have asked the question, How can I add one stage of radio frequency amplification to my regenerative receiver? St Louis 20-oh- James F. Barton, formerly adjutant of the Iowa department of the Amer lean Legion, has assumed his duties as assistant national adjutant. Barton took over a large part of the routine duties of the adjutants office. In this way, National Adjt Russell Creviston Is left free to devote more of his time to the $5,900,000 endowment fund which the Legion is raising for the disabled and the orlie had phans of the World war. been handling tlife duties of the national adjutancy and of the executive secretaryship of the endowment fund. With the extension of the campaign for the endowment to every state in the Union, the pressure of duties of the executive secretaryship became greater and he found it Impossible to continue to perform the duties of the two positions. Bartons appointment relieved him of purt of the load and gave him more time for field work. Barton Las long been active in Legion work. Members of the Iowa department give him much of the credit Interesting practice in mine laying was had by the Seventh coast artillery at Fort Hancock. The Illustration a mine being laid by the crew of the ti. S. S.General Ord, and, at right, a mine exploding. shows Chicagos Typhoid Germ Murder Trial five-tub- $ I ) jjj Post-Dispatc- i Welding Tube Filament With Regular Current No doubt all radiophans have experienced the bad luck of burning out a tube, usually just when an extra is not at hand. If you have patience and carefully follow these directions tubes. you can repair your bumed-ou- t The method of doing this is quite simple as can be seen in the illustration. The burned-ou- t tube is placed in a socket and wires led to the filament binding posts, and these connected to the battery. About four volts is all that Is required, and is often better than the usual six. The bulb is held in one hand, the other being used to strike the bulb as shown by the arrow in the Illustration. The bulb should be held so that the plate Is In the position shown. The bulb may require quite a lot of hitting before the broken filament will touch and weld. After the filaments touch the current will weld them together, but the tube will have to be handled with care so as not to jar them apart Bulbs repaired in this manner will give nearly as good results as new ones. They also make excellent detectors, sometimes being better than the ordinary detector tube, as they can use more current on the plate (If the tube Is an amplifier). These silk-covere- for the remarkable record which that department has made. He served as adjutant of the department from the fall of 1920 until his transfer to national headquarters. The new assistant national adjutants first activity In the Legion was as commander of the post at Fort Dodge, Iowa, his home town. He was elected to that position before the first national convention of the Legion in 1919 and served until his appointment as department adjutant. Dr. R. J. Laird of Algona, Iowa, took the department adjutancy folLaird lowing Bartons resignation. resigned as national executive committeeman. That position was filled by Maurice Cahill of Cedar Rapids, Iowa, formerly alternate committee- & P" . Scene in the court room of Judge Lynch in Chicago where William D. Shepherd is on trial charged with murdering William N. McCllntock, his millionaire foster son, by administering typhoid germs to him. . V j iv. . Admiral Is Going to the Far North HERRICK PLAYS GOLF man. Would Make It Harder to Amend Constitution A resolution making amendments to the Constitution of the United States more difficult was Introduced in Frank-lln- g post of the American Legion, Columbus, Ohio, by L. D. Bower, Journal clerk of the Ohio senate. The resolution proposes an amendment to Article V of the Constitution s making It necessary to secure a of memberthe actual majority ship in congress to initiate an amendWhile the ratification of an ment. amendment by the state legislatures of the states is still of three-fourth- s retained, the resolution proposes that such ratification must represent 'three-fourth- s of the congressional representation of all the states. The resolution also provides that ratification must be accomplished within five years from the date of submission to the states. Bower claims tlmt under the provisions of Article V of the Constitution, not only may an amendment to the Constitution be proposed for ratification by even less than a minority of congress, but that the Constitution pow may be ratified by a minority representation of the voting population. two-third- lf one-eight- h Bulb Should Be Held So Plate Is In Position Shown. bulbs require much less current than the ordinary tube with almost as good results. The bulbs described are those of the older make (UV-20- 0 and 201) ; however, the newer ones (UV-201- ) may be repaired in this way In many cases. Radio Digest. Hints That Will Be of Interest to Radio Fans Copper foil makes the best fixed condenser. Keep wires straight; a kink In a wire may cause it to break. 9 be clips and terminals of a battery should lie cleaned once a week. A small watch case voltmeter Is a valuable accessory to any radio set. A crystal receiver provides the simples! means of detecting radio signals. Rubbing over a bakelite panel with an rag will make the surface look like new. A fairly good loud speaker can be made by fitting a telephone receiver into ;:n old phonograph horn. Ki ep the grid leaks of an ampliflei as sh.irt as possible. The shorter they are the less chance of howling. The proper test for a battery should be made with a voltmeter after the set has been operating about 20 minutes. Classification That queer looking place on the right which we are now passing, announced the guide on the bus, is tht old Indian burying ground. And where, queried one of his fair did they bury the young passengers, Ambassador Herrick playing on th American team at the St. Cloud Country club during the diplomatic corps golf tournament. t Lieut. Commander K. E. Byrd, who will bead the navy contingent In the MacMillan expedition to the Arctic, will take along two dozen of the navy's Admiral, homing pigeons, which are being especially trained for the trip. one of the most famous of these birds, is here seen ubout to be released for a flight. KILLS MAMMAS RIVAL Boat Beats Fastest Trains Time ' ' , ' ' S sight-seein- g Indians? Amerlcau Legion Weekly. City of Kings The City of Kings, Is the name Flzarro gave to the capital of Peru, when he founded It. In 1535. It was gradually supplanted by the name Lima, and was seldom used after the Seventeenth century. A Choice of Evils are you Youngster What Studying French for? Second Youngster So I wont have to take music lessons. First Lucille Wuuseh of Chicago, sixteen years old, who fatally shot Agnes Situ-nle- k and shot her father and her mother, the last being accidental. Lucille and Mrs. Wunsch found Wunsch In conversation with Miss Simnlck at 0 an 57 Richard miles F. Hoyt, averaging Teaser, speedboat owned by hour and beating the time of the Twentieth Century train between New York the latters home and the young giif opened fire. A coroners Jury freed hsa and Albuny. |
