Evening Star Newspaper, April 5, 1929, Page 23

SCIENTISTS STUDY l UNUSUAL MAGNET Powerful Force Is Generated i by Thermoelectric Device in New York. BY H. H. SHELDON. Much interest has recently been shown by scientists in New York and elsewhere in a new thermoelectric mag- net of unusual power. This magnet, which was first shown in New York at the American Institute of Science din- ner, is capable of lifting a weight of more than 200 pounds and has, in fact, been shown to be capable, under favor- able conditions, of supporting a 400- pound load. It can now be seén at the Museum of Peaceful.Arts on Fortieth street. The behavior of this magnet, ac- tuated as it is by a thermoelectric current, is so striking that the author was under the impression that the whole affair was a hoax. Subsequent examination . and _analysis, howeyer, have shown that it accomplishes this seemingly impossible feat because of unusually careful design. It is the work of Dr. Paul E. Klopsteg Of the Central Scientific Co., who designed it purely for classroom demonstration. No commerical application is as yet in sight. 1826 Discovery Applied. But to appreciate the significance of the achievement let us see what is the thermoelectric current which actuates this magnet. Seebeck, in 1826, discov- ered that if two pieces of wire of dif- ferent materials, copper and iron, for example, and at different temperatures, had their ends joined together a cur- rent would flow through them. While the current so derived from the direct application of heat has never had any| commerical value because of its feeble- ness, it, nevertheless, is important in that it points the to a direct gen- eration of electrical power without the { intervention of boilers, dynamos and all the rest of the paraphernalia ordi- narily used. It has, however, had enormous vaiue as a method of measuring temperature. It is the underlying principle of the usual commercial pyrometer, which has founds it way into almost every com- mericial process, especially since the war, Here the metals used are such that the current produced is pro- portional to the temperature, and as a sensitive instrument is used no great current is necessary. Star's Temperature Measured. ‘When many thermocouples are joined together the instrument is called a thermopile. Such an instrument is so sensitive that if one bundle of junc- tions is turned a star and the other bundle shaded the star’s temperature can be meassured. - Dr. E. E. Free re- cently demonstrated the sensitivity of such a device by measuring the blush on a young woman's cheek and its KATHLEEN FITCH Of Lexington was named quecen of the j:nlar}nnm at University of Kentucky, pril 4. mated, that the current is probably about 135 amperes. ‘The magnetic effect of this current can be reproduced by winding a coil of wire into the groove and actuating the magnet by means of a battery. By | this method the current value of 135 amperes has been shown to be at least approximately correct. When used in| this way an astonishing thing was also revealed. A single dry cell was capable of supporting the weight of three men of 160 pounds eac Just what all this may mean beyond the demonstration stage is difficult to say. So far no one has suggesfed a single use which may make this device commercially valuable, As a method of generating electricity, striking though | its results may be, it is perhaps not more than 2 or 3 per cent efficient. Much effort and clever design have been necessary to bring it even to this point, It can only be said that the direction which future developments must take has been pointed out. Perhaps the genius of an Edison or of a Steinmetz will find some way to harness this novel power source. Auto industry absorbs 60 per cent of ;ll ‘glatc glass produced in the United ADVERTISEME! 'NEW HERB EXTRACT | WAS A BLESSING | TO HER, SHE SAYS Washington Woman Tells| Why She Prefers This Great| Medicine to Others. change under various emotions. It has long been the dream of in- ||i ventors to. provide power direct from | sunlight by means of thermopiles. It | RQas been thought that if one group of | wire junctions were exposed to the | direct” sunlight and the other group | buried or immersed in water to keep | them at a lower temperature powes ||| could be produced. Such attempts| have always failed, for as more and| more thermocouples are added to in. crease the output we are at ihe same | time adding more and and more electri- cal resistance, with the final result that all the voltage of additional thermo- couples is consumed in sending current through its fellows. This happens before any current of real value is ever ob- tained. One inventor working on this prob- lem discovered a useful product, how- | ever, in the high resistance wire now | used on electric stoves, toasters and ||| other electric heating devices. But he | did not solve the thermocouple problem. Similar Inventions Recalled. Up to the present time the most spectacular results that have been ob- tained were nothing as compared to this latest feat. Noe, in Germany, con- ||| structed a thermocouple which, heated | by a gas film, would ring an electric | bell or charge a battery. Wunder con- | structed one whose current sent through | an electromagnet would cause. it 10 | support a heavy latchkey. Volkmann | | improved this by building one which is | said to have supported 20 kilograms (about 45 pounds). But Klopsteg's sup- | ports 400 pounds. ; How he does it? Not by many ther- couples with their added resistance, but with one. Not by an electromag- net with a huge number of turns .of wire, but by one haying a single turn. The entire apparatus is so small that it can be put into a cigar box. The effort has been not to produce high | voltage, but to defeat the deman, elec- | frical and resistanee, the ‘'stubborn indi- | wvidual who is not always so willing to take orders as we should like to have it | them. The magnet itself is a disk of soft iron about 4 inches in diameter and an inch thick. A circular groove is cut in this and a heavy copper bar bent into it. Slots are cut to allow the ends of the bar to protrude outward about an inch or so. These ends are joined by a stout bar of copper-nickel alloy. It is the junction of this with the copper that forms the thermocouple. One End Immersed. Near each junction there is ffitened & copper fin of several square inches in area. One of these, in operation, is heated by a gas flame and serves to conduct the heat to-the junction, ari the other is immersed in a jar of water for the purpose of keeping the second junction cool. The *temperature ference between the junctions causes the current to flow through the bar to. actuate the magnet. A second disk is supplied to which is attached a stout hook and when this Adisk is held against the magnet it will support the weights previously de- scribed, The faces of the two disks are carefully machined to afford close mag- netic contact, a which is essen- tial to the success the demonstra- tion. 1t has been computed that with the temperature difference which exists be- 355 Begnece . there muts vs a voltage 50 degrees C., mi a v produced of about !&m.een thousandths of a volt. This would normally produce little current, but under the conditions of low resistance present, it 'is es! S I Hundreds of people are now call- | ing at the Peoples Drug Store, 505 | 7th Street N.W. to inquire about| and purchase this great Hérb, Remedy that has met with such in- | stant success here in the city, . | P4 Miss Margie Romine. Statements are received almost | |dally and people who have given. Miller's Herb Extract a- trial, say that it has proven to be a blessing | |to_them. Miss Margie Romine, of 12038 37th St. N.W., says that she | received more real benefit from the | new Herb Extract than any remedy | she ever used, and that she is will- ing to recommend to every one in need of a medicine of this kind. In | giving her statement, she sais A have found this medicine to be just |as advertised and was really sur- | prised at the relief I obtained. I had for some time suffered with gas, | | indigestion, and food I ate would { sour on the stomach. Then, too, I| | was always constipated and had | | severe atfacks of headaches and | seemed to be losing all my energy, and was so restless I could | not sleep or rest after going to bed. | I tried various remedies, but they[ did not seem to fit my case; in fact, | Miller’s Herb Extract gave me the | first real relief I had. Through its action on the bowels I was soon re- lieved of the constipation, and from then on I began to feel better in every way; food I ate no longer | soured, gas and indigestion pains | passed away and I was able to sleep and get my proper rest at nlght.‘ ‘The best way I know to. describe the change in me is to say that I | feel almost like & new person and }I give Miller’s Herb Extract full | credit for this wonderful change. It |is pleasant to take and really does all claimed for it.” (There is only] one Miller's Herb Extract, formerly | called < Herb Juice; ask for ‘it by name.) You don’t need any pills with this medicine. It is a real medicine within itself and guar- anteed to give results. A medicine you can take three or four bottles without seeing any resull’h is not eadquarters at Peop] Drug Store No. 2, 505 7th W., and have him explain the superios merits of this great nature tonic | WARDMAN PARK HOTEL| DINNER Saturday Evening, April 6th at 7:30 Featuring Another ° All-Famous M. C. A. Orchestra, the . .- d Q’.\. N Al Special Entertainment Couvert, $1.00 ~ Are Youin a Harr.jvf You Can Read This Announcement.in Less Than 3 Minutes! LANSBURGH & BRO New Dresses Show the Vivid Color of Youth - $10.95 There are printed chif- fons, printed crepes and plain flat crepes—fashion- ed with soft fluttering capes, scarfs, tight hip- lines for slim hips, jaunty belts and frills. Many have jackets!—In new greens and yellows, tan, blue and red. Sizes 13 to 19. junfor Misses' Shop— el econd Floor Scarfs Enliven the New Mode $1.95 Smart, for they are in the new long shapes—and doubly smart for they are in two and three color tones. Of course black with white, purple with orchid and lavender, and tan with brown and orange—and dozens more. | Searfs—Street ' Floor Take their Places on Spring Apparel 50c i £ Felt flowers for sports wear—patent leather ones for tailleur wear—white, peach, pink, red; blue and yellow gardenias for either afternoon or evening—in fact they are always - . smart—and for any oc- O Offered in a.,Sale Tomorrow At Our “Best Selling” Price 8150 Were we to mention the name of this stocking you would at once recognize it as one of our “best sellers”! Beautiful chiffon stockings— with picot tops and French heels! Silk to the top, full fashioned, sheer, clear and evenly woven. With silk interlining at top and silk feet with heels and toes lisle lined for added service. Choice of These Shades / Eight style-right shades—that match the warm glowing tones of the sunburned skin—or blend smartly with Spring’s new colors! French beige, French nude, allure, promenade, plaza, sun- blush, Hollywood and sun-bronze! 8! to 105, Hosiery—Street Floor We Carry Only First Quality Hosiery Patent, Brown or Blonde Kid Footwear Is Smart ‘And Here the Price of Smartness is Minimized $5,95 Anywhere you can find shoes at $5.95—but nowhere do you find styles and leathers as smart as these for $5.95! Everything the smart modern wants is here—patent leather straps and pumps, brown kid :e straps, blonde kid pumps and straps—styles for every hour of the y! For business, a patent one-strap, with medium high heel. $5.95. The patent pump; medium toe and high heel. $5.95. Brown kid A blonde kid buckle one-strap; twoystrap, with cut-outs and high imitation ke. heel. $5.95, $5.95. Shoe Shop—Second Floor Skipched ‘Artachied Collar Shirts Are Demanded <~ By Well Dressed Men——SpecialI& Priced $1.65 A crisply starched col- lar does away with the sloppy informality of soft cloth, presenting a far neat- er appearance. These are of imported striped broad- cloth on green, blue and tan: grounds—made to our exacting specifications by one' of our regular ‘manufacturers. 13V5t017. _Men’s Silk and Rayon . Men’s Rayon Union . Suits Will Dispel . .Summer Heat, $1.95 " 7th, 8th and E Sts.—FAMOUS FOR QUALITY SINCE 1860—Franklin 7400 airs Picot-Top Silk' Stockings The Approved Hat Modes $5 ~The smart woman this season chooses her hat to suit her own per- sonality! Milans, tuscas, ' viscas, petalines, hairs and novelty straws— copies of Molyneux’s curtain back hat (pictured), Patou’s side flare, Reboux’s tricorn and dozens more. “In black and new high colors. Millinery Shop—Second Floor Delettrez Toiletries Are to Be Had Only at Lansburgh & Bro.in D.C. The House of Delettrez—founded by the famous Frenchman, Delettrez—the creator of ravishing beauty in the Courts of France during the Nine-. teenth century—sends to us its exquisite, delicately fragrantized creams, lotions and beautifiers so that American women, too, may have complexions as sheer and delicate as the petals of orchids. Cleansing Cream ..................51 and $2.50 Buttermiik Skin Food ............ Black Head and Open Pore Wash...... ..$1.00 Eye Lotion ... Bleach Cream Face Powder Lip Sticks ... Tollet Goods—Street Floor The Last Day to Consult With the Gossard Stylist Now In Our Corset Shop—Third Floor Just how to make your figure look smarter, and just how to appear at your best in all your gowns, is being demonstrated in our Corset Shop this week . by Madame Castello de Beaulieu. Tomorrow is her Jast day—come in and let her fit you personally in one of these new Gossard garments. Left — A hookaround, featuring wide, lightly boned panels oyal batiste at front and back. Raised Charmosette front s insuring perfect hiplines, $10. Corset Shop—Third Floor