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Show THE SAUNA SUN. SAUNA, UTAH V j eaufiuzme GOHOEtlSER 7Y C Txnaert ConCHSt GR'OCOnj. R.F. , D5T ffuCft Art TV During the first six months of 1926 one in every four buyers of new automobiles bought a General Motors can During 1925 the proportion was about one in five During 1924 it was one in six This steady addition of new friends for the products of General Motors has a double significance Diagram Showing Tandem Tuning Scheme. By 2EH BOUCK In the New York Herald-TribunIt Is the purpose of this article to consider the new Ideas Involved In e. tuning several cir- radio-frequenc- y cuits simultaneously by means of two of more condensers mounted on a single shaft. The problems of tandem tuning are really nothing more than the problems of scientific set design slightly emphasized. In some respects they are mechanical rather than electrical, and in all cases are modified, with other problems, In Individual receiver There are, however, some design. general points which should receive primary consideration before the specific niceties are tackled. There Is really only one fundamental "secret to successful tandem tun- Ing. This Is the matching of Inductive and capacitative values In the individual tuning circuits, which considers the Inductance and capacity Introduced by leads and wiring. It is . the problem of the designer so to .arrange fils parts and their interconnections that the parasitic capacities and Inductances are either negligible or are the same 'in each stage of radio- .frequency amplification. This accomplished there remain only the matching of the deliberate Inductances (the tuning colls) and the capacities of the tuning condensers. The latter is taken care of In the case of any reliable condenser, such as the Amsco Siamese," which the writer used In his experiments. It Is the designers Job to match the Inductors. "Vernier capacitances and inductors,- of any type whatever, can be used to balaaee-sfcr- ay capacities values as well as poorly matched inductors. However, no vernier can efficiently compensate the capacitative discrepancies in some types of condensers. Compensation on one wave length Is immediately upset upon tuning tt another frequency. Coils Recommended. Cdils characterized by a relatively law L to C ratio are recommended for ' use In tandem circuits, contrary to , In ' other words general practice. space-woun- d coils and similar tricks designed to reduce the capacity of . the windings, are not recommended In tandem tuning circuits. .The use of higher capacity coils lowers the proportion of tube and stray capacity to total circuit minimum capacity, thus reducing whatever effect .'tube changing may have upon tuning. Tandem tuning, heedless to say, can .. .be. adapted to practically any tuning Messages May Travel Over Separate Paths e ' on Your Crystal Set Crystal Rets without tubes are for sets .will local stations. One-tubreach--ou- t almost as well as multi-tub- e sets if a good aerial is installed-- . .Tubes added after the' detector add . little If any to the distance. received, but do add greatly to the .volume. Tubes before the detector mean sensi-- . tlveness and permit- - only a small A aerial to get thp same distance. loop is not used without radio-fre-- . queuey- amplifications . e - - Simplifying Radio . Fifty feet of wire of little more than pencil thickness, hung vertically from of a wooden pole 70 the cross-arfeet high, has been flashing radio programs from 2XAF, Schenectady, N. Y., to practically eery corner of the habitable globe. 1. It is proof that the grouping of strong 2. Increased public patronage involves increased obligation. General Motors is directly responsible for the welfare of its 152,000 employees and their families, its 20,000 dealers, and indirectly for the six thousand companies which furnish it with supplies and materials at least a million men. CHEVROLET Length of Aerial to Get Desired Results Use a short aerial for selectivity, and a long outdoor aerial for volume and distance. A combination of the two can easily be arranged by indouble-throstalling a single-pol- e switch. Rum a length of bell one or. two rooms or around the molding In one room for the indoor aerial, . the end of which is attached t'o one of the switch posts. The other post is attached to the long aerial coming In from the outside. Tile center contact goes to' the aerial post on the set. PONTIAC OLDSMOBILE - OAKLAND GMC TRUCKS BUICK - CADILLAC YELLOW CABS, BUSES AND TRUCKS - - o "A car for every purse Paid Sun Worshipers At the hour of midnight on June 24 high-cast- e Indians climbed the North Cape to pray to the midnight sun, with flowers and fire, in accordance with the ancient veda rites. Brahmin Rai Gopaldgs, to the maharajah of Ilaroda, pays pilgrims every year to go to the North Cape to' pray to the midnight sun, which he considers the symbol of the eternal God's sun in the physical ' world. Indians Consume Ancestors Bones Eating the bones of ancestors is one of the strange customs of Indian tribes in the wilds of Brazil. From 15 to 20 years after burial, the bones are disinterred, pounded to powder and mixed with the drink taken at certain festivals, apparently will) the idea that the souls and power of the ancestors will he communicated to the bodies of the descendants. The men of these tribes are much finer in physique and grace of figure than the women, who are likely to be "Willie, did you see papas razor? stumpy and small, Dr. William Mont"No. maam, but I know where the gomery McGovern, English traveler can opener is. and explorer, N quoted in an interview published by the New York World. Deformed persons, however, are almost unknown. They are killed at birth, ns also are twins, wlio are regarded as evil things. Doctor McGovern says he found the native diet of monkey nnd red ants Ants taste like very nice, indeed. 6 Bell-an- s crisp bacon, while monkey is a cross between pesk-an- d chicken. Hot Smart Boy The total Immigration into PalesIlenry Ford discussed the English coal situation at a Dearborn dinner. tine for 1025, exclusive of tourists and The English coal economy advo- visitors, was 33.S01, a figure nearly cates, said Mr. Ford, remind me of equal to thq combined totals of the four preceding years. The net gain the bride whose husband said : Darling, did you sew that button by Immigration In the period from the on my coat? armistice to 1925 Is about 70,000. No, sweetheart, said the bride, I couldnt find a button; but its all Chance right. I sewed up the buttonhole." I bear Jones went to the North pole." Veracity Ls the heart of morality. "Yes, going to open up a string of hot-do- g Huxley. stands. r C lira . o. Sure Relief water Sure Relief By Way of Explanation ELL-AN-S Molly was sent to the grocer by her mother with instructions to hurry back. After a long nbsence she arrived home with the shopping. Where have you been nil tills time? asked her mother severely. I was playing with Joan, was the FOR INDIGESTION 254 and 75$ Pkg's.Sold Everywhere j Ends Are you being bored to death? TV Flit spray clears your home in a few minutes of flies and mosquitoes. It is clean, safe diseas- e-bearing and easy to use. back? was Mollys agWhy mother, grieved reply, I did hurry hack like I met Joan .going. You anything didnt fell me to hurry going. minute CORNS Dr.SchoH'sZlno-padsfstheMfe.aara.hemll- Kills'AlI Household Insects they-hid- Promoted DX Scholl's Zitto-pad- s Futonaorriha V- -- have a private secretary now. Did you fire the old stenograph No, but I pay her $2 more." 1 patn it gone .jfahrics. Flit is the result of exhaustive research by expert entomologists and chemists. It is harmless to mankind. Flit has replaced the old methods because it kills all the insects and does . SELDOM SEE ATtir A Bath With m. 4 Deliotlclf Medicated Of rielni I raronoe jS it off without layup the horse. Ko blister, balr gone. Concentrated will clean Loop Aeriala only a few drnpn required at en application. DsrcvRE your Looks! oiperiTnt on utr MITCHELL I YK SM.YB for tp ruef. at all tfrocrlst. , HALL HDC-nr-L- AteiuU-i- New York sp'y tai. rnt j $2. SO per bottle de- Desc-ib- e livered. your case for special instructions, end Boot &A free V. F. YOlNO !hc, 510 Ljrmi St, SprinrficU, Min. W. N. U., Salt Lake City, No. 26.' it quickly. , Get a Flit can and sprayer today. For sale everywhere. STANDARD OIL CO. (NEW JERSEY) threat. GutlcuraTalcum " . big knee Ilk this, but your hors may have a bunch or bruise on hie ankle, hock, etiHe, knee or Cuticura Soap Dust With , Flit spray also destroys bed bug oacbes and ants. It searches e out the cracks and crevices where and breed, and destroys insects and their eggs. Spray Flit on your garments. Flit kills moths and their larvae which eat holes. Extensive tests showed that Flit spray did not stain the most delicate treatment for corse. At drag end shoe etoree. For Free Sample mittTUScLoH lifg.Gh, TOSQUITO torture is quickly ended if you keep a can of Flit handy. IVl explanation. I thought I told you to hurry paininone . ' From the experience of radio .ongl neers throughout the country It has been ' found that the average loop aerial' is about 5 per cent as efficient as the overage outdoor ncii d. 'indoor aerials are from 10 to 10 p- - cent a ' afficiect. Palestine Immigration Button, Button wire-throug- . and purpose General Motors passenger cars, Delco Light electric plants and Frigidaire electric refrigerators may be purchased on the 6 MAC Plan. n .' 5 GENERAL MOTORS Range and How to Keep in Tune Two simple principles applied to the. average receiving set will enable the operator to keep In tune" with all waves from 200 to 600 meters. If a coil of wire Is placed In series with the antenna, it has virtually the same effect as Increasing the wave of the antenna, thereby making It possible to pick up higher wave lengths. The larger the coil, the greater will be .the Increase In wave length. If a variable condenser Is placed in series with the antenna or ground' wire, the wave length .gauge of the set is reduced. The smaller the capacity of the condenser, the greater will be the cut in wave length. To place a coll in series with the antenna, connect the lead-iwire to one end of the coll and run a wire from the other terminal of the coll to the antenna binding post .on the set. A series condenser is connected the same way.. women and children to whom its public good is a very personal concern. As the volume of production increases there must be a corresponding increase in the values offered. The new series of cars just presented does embody larger values; it is a direct reflection of the fact that more than 1,075,000 General Motors cars were 6old at retail during the year just closed. The added quality has been built in where its presence counts most in comfort and safety and long life. With great pride we invite you to inspect these new General Motors cars. com- panies in one big family is economically sound. Large scale operations do make possible important economies; and these economies do benefit the buyer, in greater value. The public has recognised this principle and profited by it. radio-frequenc- Wave-Lengt- Radio 'messages, frequently travel from a broadcasting station to a receiving set over two entirely separate paths. Scientists of the 'General Electric company, according to Dr. E. B. Free's press bulletin, the Weeks Science (New York), report the discovery of further facts confirming this Idea : One" path Is along the surface of the ground. The other path is through' the high levels' of the air fifty or a "hundred miles above the earth. When "both these waves arrive at the same 'receiving set- - they sometimes Interfere. This may, cause what radio fans call fading, or some other disturbances of reception. Much progress has .been made recently in understanding Just how radio waves move thnongh-thAs ether from place to place. these facts become better known and 'are applied, we may expect further- improvement in the quality of "the radio waves sent out. .. Part Played by Tubes system. A fundamental circuit accompanies these notes. Attention is particularly directed to the input or antenna coupling circuit. The proximity of the antenna circuit, in almost every case, will throw the tuning of the first condenser out of alignment unless this condition is especially considered and There are two properly compensated. Immediately possible ways of doing this. The first is to employ the usual aperiodic primary with very loose coupling, or variable coupling correctly compensated by the King Equa-mati- c The second, and at system. present preferable arrangement, is the use of the antenna tuning condenser C. A certain optimum Input (across primary) capacity should be decided upon by the designer say 95 or thirty micromicrofarads. The average antenna capacity will vary anywhere between this value nnd perhaps 200 "micromikes. To reduce it to the desired across-coi- l capacity, the series condenser of about 50 mfd. is Introduced as suggested. The condenser is varied for individual antennas, nnd left set when the correct value is discovered. It is recommended that this condenser be mounted within the cabinet, to discourage the itching fingtrs of the average fan. Antenn, Compensation. y If two stages of tuned are employed amplification previous to the detector tube, with one single and one tandem condenser, it is advisable to shunt the single condenser across the first secondary. This will eliminate the antenna comcompensation problem. (Antenna pensation however, is still desirable if only to maintain dial alignment) Almost any efficient system of the r. f. stages is recommended for use with tandem tuning circuits. The addition of the stabilizing arrnn- - ment presents no extraordinary difficulties. All grid returns, In virtue of the common grounded rotorare"b,-ough- t down to the negative side of the A battery. This fact slightly modifies the detector circuit. Detecting postulates a positive grid potential. To secure this, instead of shunting the gild condenser with the leak, as is usually done when the grid return is broucht down to the plus filament' terminal, the resistor is connected between the grid and filament (plus of course) direct Tandem tuning presents no real Acuities and demands only the intelligent application that must go into the design and building of any receiver satisfactory to the discriminating m. Jo |