Evening Star Newspaper, July 12, 1922, Page 18

=== ERT ADVICE ON RADIO| No. 51—Do We See By Radio?’ WW BY A. HYATT VERRIL, sion of late, and which Mr. Mardoni Expert Technol is credited with believing come from e Redia 1987 | gnother planet, possibly the spiFit To say . that we by radio seems plane. rather far-fetched, and yet the nu- If you have stullied radio at all you man eve has been likened to the have know that your recsiving sets of Wi aerial of a radio set, the nerves re- only & limited rangi cording the waves of light and carry- reception. You may for waves varying in length from 100 ing them along to their final impres- 2 sion upon the brain. The optic nerve to 1,500 meters, but below or above st serves as the detector to .transform that the wave by undetecte: The principle is the same with the light waves to sensitions or imprese sions in the brain. This might well Ruman eye. We cannot psee the longer waves, but our nerves detect be contrasted with the crystal. tube <f the radio set. them and record them in the hu body as “heat.” 'The very long wa With the sensation-of heat much the same thing happers, except that are not recorded by the nerves, consequently man must resort to the m. our skin acts as thé aerial to pick up the wave, the nerves carrying the use of instruments to th Modern sgientific experiments hav proven that there is a strong siml- larity between the long heat wave and the short wireles wave—in fact, wave to the brain, where it is regis- | the two are identical save for length. tered as heat. The great minds are now at work el Many scientists believe that heat|deavoring to bridge the gap betwee and light waves are identical, vary- | the one-tenth-inch wave and the ing only in quality or length, and twelve-inch wave, and when this fe: that there is au regular graduation|is accomplished it is generally b from ome to tha other. And we are |lieved that the radio waves picked up almost convinced that their theory |from broadcasting stations, ray ot is right, when we take a piece of iron light from incandescent lamps and and heat It may becomo so hot as to burn wood or paper and yet it will retain its dull black color. Heat it again, and gradually it becomes red in color—the more you heat it the will be brighter the color becomes. But when we begin to trace the graduation of heat waves to radio waves we find a more difficult problem, for there are gaps missing in the transition which have not yet been bridsed. Differ in Length. Modern science claims that the chief difference between heat, light and radio waves is the difference in wave length. The longest waves yet re- corded are the erions’ ether waves picked up by Marconi are the much under dt the warmth from our fire: found one and the same thi: This is, indeed, the age of miracles, and nothing seems impossible wherq radio is concerned. Solentis are predicjing great things when these missing waves are found—these oscil- lations that lle between the one-foot and the ona-tenth-inch waves. In- | deed, prediction has it that a means | will 'be evolved whereby our bodies. or rather our nerves, will pick up messages and music from the broad- | casting stations without the tse of |any mechanical device whatever. One | thing seems certain, and that is, with the perfection of radio radical | changes in all fields of endeavor will ‘io«‘ ur throughout the clvilized world. (Copyright, 1922. New Apparatus and Devices By Ralph Brown, Radio Expert: A UNIQUE BINDING POST Buch a plebelan thing as a binging post might not be thought worthy of much consideration when such things as regenerative receivers and radio frequency amplifiers are beink de- signed. Sometimes, however, a small thing will cause a set to stand out| above others, and it is, of course, true | that small details are not to be over- looked. One of the unigue features of the binding posts illustrated is that the contact surf d the full width of the posis and operate parallel with each othe This pe mits a very fine wire, a cable or large pin to be rea marring or damag Outwardly the post is quite similar ,160 meters by radiophone. to, others in desizn. but r 9:50 p.m.—Weather report. is quite diff which are 3 is a main body knurled screw cap. The 3 sulated. When it is turned in on: ¢ ~ direction the siiding shoo is moved Opened Closed down until it clamps the wire b connector a; nst the bas There {ing mounted. The posts, however, imay be had without these dowels if iesired. 'There are various sizes, 50 s | that any size wire or terminal mhy used | be accommodated. The threaded ex- tension may be had in @ither an 8-32 or a 10-32 thread. While not a cheap post, it is effi- cient, durable and economical in the long run and will probably meet with considerable favor where care is given to small details in the construction of radio equipment. t to cut the w in th no sharp po ing the k b opposi 1 relc pade terminals as pin ter The base is insu B terial which does not from constant uss or ro chip) ily handling. The same material is used in the in- sulated knob. The posts illustrated have dowels in their has vent the posts from turn INSTRUCTOR NEW YORK. Y. M.C.A. RADIO 'SCHOOL VOLTAGE AMPLIFICATION CONSTANT. The foregoing might be considered from a different angle. Suppose that a certain plate current fluctuation is by a certain grid potential variati Then suppose that it took a plate potential seven times that of the grid to produce the same fluc- tuation of plate current. The grid potential variations would have seven times the effect on the plate current |as the same plate potential varia- tions. There is a ratio of seven be- tween the grid variations and plate variations of potential which will produce the same fluctuation of plate current. This ratio is calle the “voltage amplication factor, merely amplification factor.” It has been found that this ratio, the amplification factor, increases with a decrease in the spacing be- tween the grid wires, and vice-versa. It also_has been found to vary with the relation between the distances between plate and fllament anw be- tween grid and filament. For best amplification factor, them, a tube with a fine mesh grid set, considera- bly closer to the filament than fis the plate, should be used. The ratio or factor is not exactly a constant under all conditions, but readily ex plains a value of the grid and the differences between: tubes used as amplifiers of input voltage to the grid circuit. Tt has been pointed out that under certain conditions the plate current can be made to alternate above and below a certain steady value without changing its direction of flow. That is, that under these conditions an alter- nating potential applied to the grid will cause a rising and f current. Suppose that w variation of the voltage the grid from a generator the plate current varies ten units above and below its normal value. pose that the same variation voltage is caused by putting the gen- erator in the plate circuit in series with the plate battery. The plate voltage will rise and fall about a steady value as the generator alter- nately adds to and subtracts from the plats battery voltage. At the same time the plate current will also fncrease and decrease about its steady or normal value, but this time the variation is oply one unit above and below normal It is seen that the same alternating voltage applied to the grid caused greater plate current variation. This is where the value of the.grid comies in. It acts as a trigger or controb valve and produces a relayi ction, so that very small potential fluctuations on the grid cause comparatively large plate current fluctuations. EFFECT OF ALTERNATING GRID VOLTAGE ON PLATE CURRENT. generator voltage increases the grid becomes more and more negative than it was in its normal condition and the plate current is reduced. When the peak of the generator voltage in this opposite direction is reached the grid has a maximum negative charge and the plate current has fallen to & minimum value below the normal. The generator voltage then decreases and with it the negative charge on the grid. When the generator volt- age is again zero, momentarily, ,the grid charge is again normal, as is lso, the plate current. , It is thus seen that the plate cur- rent rises and falls about a certain normal value in exact step with the rise and fall and reversal of ge tor voltage. The plate current does not actually reverse its direction of flow, but appears to do 80 if the no mal value is considered to be the c terion. 1In other words, the plate current alternates about & normal steady value, but not about a szero value. No id ocurrent, however, t With a certain positive potential on the plate and a certain current through the filament of a vacuum tube a certain plate current flows which may be called the normal plate current.. W% will assume this is not a saturation value, which would be produced if the plate were agracting electrons just as fast as they were being emitted from the filament. If ‘we then aiply & certain negative potential constantly to the grid the plate current will be reduced a cer- tain amount, and there will be a new value of normal plate current. The plate current may now be in- creased or decreased accordingly as the negative grid potentlal is either decreased or increased. The negative potential applied to the grid may be called the normal grid potential. With conditions normally as above, 168 ub supposs tHat a gereraton of | onleiar.ony. Gle SInaettiv gTE Very small alternating voltage is.con- | *\ Hmes negative. nected into.the cirouit of the grid, =0 \ that this circuit comprises the tube HEST FOR THE WEARY. space between grid and filament—the grid battery with its negative termi- nal connected to the grid, the alter- The Washington city post office is niting voltage generator and the{among ten offices of the country that have been authorized to install rest bars for distributing- clerks, now connecting wires. Let us aiso as- sume that the generator voltage forced to stand. all day before their cases. / never reaches exactly the same value as the grid battery voltage. When t me;n::l avpliee = positive volt- age to the ts constant negative | Experfments with var: potential 15 redused, but mot WIDed | rents have been KOIME S in the ocot out, even when the peak of the posi- | ;mce for "“n{fl“mu S tive generator potential is reached.|popular type being the A ot As the grid becomed then less and | Postmaster Chance dgsign o jess negative, the plate current in-|. Other offices in which the res creases above its normal value until,| will be installed are Chicago, Bal when the peak of the generator volt- | more, fPittsburgh, New York, Bosto e in this direction s Teached, the | Detroit, St. Louis, Philadelphia. and ;fsu current increases t6 a maxi-|San Francisco. &n mum vaiue. After thé peak genera-| ' tor voltage is passed voltage @ decreases, the grid becomes more and | GOES T0 GOYERNORS ISLAND. , more negative, and the plate current| o, ., . decreases until, when the generator . Mervyn C. Buckey, Coast Ar- voitage is momentarily zero, the grid | tillery Corps, has been relieved from potential Has returned to ifs normal|treatment at Walter Reed General ue, as has also the plate current.|Hospital, this city, and assigned to generator then reverses its volt-| the Signal Corps for a period of four and a negative potential is ap-lyears. He is detalled to temvorary | Slied 1o the KX, A% this negative duty at Goverpors Island, Ne e ! RADIO: RALF— . - 3 BY RADIO TODAY Complete Programs of Radio Broadcasting Stations. NAA—Naval Radie Station, Radls, Va. 8:45 tg 9 a.m.—Live stock receipts; live stotk markets. 10 a.m—Weather forecast for New England, New York, New Jersey, Maryland, the District of Columbia, North and South Carolina, Georgia, Florida, Alabama, Missis- sippi, Tennessee, Kentucky, West Virginia and Ohio on 2,950 meters. 10:30 a.m.—Meteorological report on 5,950 meters. 11:15 to 11:20 a.m.—Hog flash— Chicago and St. Louls. 11:30 to 11:40 a.m.—Frult and vege- table shipments. Noon—Time signal; weather report and ship orders on 2,650 meters. 1:40 to 2:25 p.m.—Fruit and vege- table markets. 2:25 to 2:55 p.m.—Crop reports and special market news. 3:45 to 4 p.m.—Closing live stock markets. 4 to 4:15 p.m.—Hay and feed mar- Kets. 5 p.m.—Weather report. 5:30 to 6 p.m.—Dally marketgram. 10 p.m.—Time signal; weather re- port; ship orders; 2,650 meters. 10:30 p.m.—Naval press news on 2,650 meters. Except where noted, sending is CW 5,950 meters. WYX—Post Office Department. 10 a.m.—Weather report for the District of Columbla, Pennsylvania, hio, Maryland, Virginia and West Virginia. 10:30 a.m.—Marketgram (fruit and vegetables) on 1,100 meters. 12:30, 2:15 and 3:30 p.m—CW marketgram telegrams on 1,980 me- ters. 5 p.m.—Wholesale dairy report on 1,160 meters by radiophone. 7:30 and 8 ‘p.m.—Market report on NOF—United States Naval Alr Sta- tion, Anacostia, D. C. 8:30 p.m.—Concert by an 8rchestra from the United States Marine Band; Taylor Branson, second leader. arch, “22d Regiment” (Herbert); overture, “Bohemian Girl” (Balfe): solo for cornet, “Asthore” (Tortere) Musiclan Arthur S. Witcomb; selec- tions from “The Fortune Teller' (Herbert); solo for violin, “Andante” oncerto” Opus 64, (Men- usician Henry C. Stephan “Adoration”_(Borowski); solo for alt: saxophone Valse Caprice, “Lonette (Henton) Musician Frank Wiblitz- uite di concert, “In Arcady” “A Shepherd's Tale,” (2) “Shep! All and Maidens Fair” (3) “Lullaby,” (4) “Tourna- ment.” _march, * the Square” (Panella); Marines' hymn, “The Halls of Montezuma”; “The Star Spangled Banner. WPM—Thomas J. Williams, Inc. (380 Meters). = 12:30 p.m.—News items; reports on stolen automobile; WEAS—The Hecht Co. (360 Meters). 7 pam—Radio vaudeville, arranged by Ted Lesser: Pete Macias’ Or- chestra, from Chevy Chase Lake— »"“Everyday.” Mrs. Willlam T. Reed, accompanied by Mrs. Wil- llam_C. Stlerlin—'The Blind Plow- man” (Clarke), “For You Alone” Pete Macias’ Orchestra, in- w song, “Try sung by Steve Rodrick, accompanied by the orches- | Mrs. William T. Reed. accom- William C. Stierlin— “Deep River” (Burleigh), “My Ain Folk" (Lemmon). E.T. Cozzens, steel guitarist, accompanied by H. E. An- gell—"Honolulu March,” ‘Jawaihan Waltz.” Herbert Swift, the minstrel —Impersonation of a colored her, Passon Jones. E. , accompanied by H. E. medley of poplar songs. Herbert Swift, “the minstrel man,” accom- panied by Mrs. Warren Horner— Cornet solo, “Sweet Dreams” (his own composition). Closing announce- ments. WJZ—Westinghouse, Newark, N. J. (360 Meters—Edstern Daylight-Sav- ing Time—Deduct One Hour). 9 am.—Agricultural reports and prices as released by New York, New Jersey and federal bureaus; program of music. y i 10 a.m.—Program of music; Duo- Art recital. Noon—Agricultural reports; weath- er forecast; program of music; Duo- Art recital. 12:156 to 1 Y.m.—astlndlrd time sig-: nals from Arlington. 1 p.m.— Program of music. 2 p.m.—Program of music. 3 p.m.—Program of music. . 4 p.m.—Base ball scores; women's fashion news; program of music. 5 p.m—Base ball scores; program p.m.—Weather forecast; agricul- tural reports: program of music. 6:00 p.m.—"“Review of the iron and steel industries and their relation to The simplest way to ead.a com is ue-jay. - A touch stops pain in- nmfl’y..,’l‘hen the gorn loosens and comes out. Made in two forms—a colorless, clear liquid (one drop dt itl) and in extra thin plasters. Use whichever form you prefer, or the liquid—the action is the same. gentle, Made ina world-famed Pennsylvania, | concert nowned for her brilliant playing, and is a complete master of her chosen in- strument. She re unusual difficulty and is an orthodox devotee to the music of the grand masters, Beethoven and Chopin. Program—(1) (Waldstein) Beethoven; con ‘grlo.) lagio, (¢) Rondo Al Adaglo (R legretto HEAVENS!! - THERE'S MRS BATURK AT ‘THE TooR! LET HER IN WHILE I BRUSH UP MY ; general business conditions,” by the|rt Iron Age. p.m. Florence Smith Vincent of the New Y.gl'ko‘Evenlng 7:00 D! Norman Hapgood, International. enstein; (3) You SEE, I AM CHAIRMAN OF A COMM(TTEE ON RELEF FOR JONE~ ARMED CHURCH-PLATE PASSERS HAR Y 11; (6) "N t(w“eh(;" el “Nocturne, Op. No. 1,” Chopin, o No. 13,7 LInLD n, and (6) “Rhapsodie Mrs. Charles Mayhew, soprano; Frank | (Blunicko). Kennedy, pianist, and & violin quar- tet from the Pittsburgh Musical In- stitute, oonsisting of Willlam Mc- Cormick, Conrad Matter, Willlam Eisenbels and Frank Freldman. Program: Baritone u!gl, “Some ‘Animal Stories,” by Telegram, enca Conference, Tan Y | KDKA—Westi: b courtesy Heart's Bast Pltts- inghouse, burgk (360 Meters —Eastern Stand- ard TH ime). 9:40 'a.m.—Phys] -g::g." song of the turn- Roy,” De Koven; (Russell); piano solos, (S8chumann), “Melody in B Major” (Rachmaninoff) and “Ec- hoven) ; ] key from 23:45 p.m.—Markets. 6 p.n.—Theatrical features; base els_in programs of | ball score 6 p.m.—Weekly summary of the ‘Careful Crossing Cam- Paig: . H. Babcock, supervisor of safety, P. and L. E. rallroad. Let- ter from Farm and Home. 6:30 p.m.—Popular musical program, name of orchestra to be announced by radio. 8 p.m.—G. D. Thompson, baritone; Iron Age. “Sonata, Op. 53" (a) Allegro Introduzione Notto teenth century; “Now Is the Month of Maying” orley), “On the Road to Ballyshe (Eilliott), “Coo Dhu” (Leoni), and “Blackbird's Song" (Scott); violin quartet, “Serenade” (b) er on .omance, No. “Alla Mans. (360 Cool Summer Suits for Men & Yoing Men These are clothes that attire you comfortably—keep you really cool—the first consideration for hot summer days. They have style, too, and they have the tailoring and the fine fabrics that will keep them stylish. Gabardires, Mohairs, Tropical Worsteds, Palm Beaches, Silk Poplins and Shantungs. models and plain sacks. ‘Tropical Worsteds, $. Mohairs, $20 i Men's Clottes Section, Second floor. Sports Palm Beaches, $16.50 Shantungs, $30 i Silkc Poplins, $40 ! No Sleeves At All N these little bloomer-aprons: for little tots of 2to 6. Justa sleeveless apron that ties on the sides and a pair of bloomers— that is all and quite enough in warm weather. You may choose from chambray or ging- ham checks, in blue or pink. * Priced $2 . Sectlon, Flapper Suits for Boys WITH pants wide cut at the bottom, sleeves cut short, and the neck low—everything for comfort when it’s hot. Fashioned of good quality khaki jean, fast color, splendidly made—unsur- passed for summer camp and vacation wear. $1.50 Sizes 3 to 8 years, Sizes 8 to 14 years, Boys' Seetion, Fourth floor. Getting into a Knicker Suit IS just about the be:it sort of thing that the girl of’8 to 16 can do these warm days. Priced $4.50 They are well and comfortably made of good, light-weight khaki—the full knickers made on an -underbody—with a smart little Peter Pan smock to wear over them—then you're ready for a good day’s outing, anywhere. Girls® Section, Fourth floor. Fourth floor, Infants' THE LAST WORD IN COMFORT— A Soft Wool Blanket Some Pillows —spread under the sheltering cool of a big tree in the woods. The blankets are those comfy, big Roman-striped ones, and they come in a variety of good colors. $6.95. Cretonne-covered Pillows, in many different colorings and shapes—$2 to $6—with a variety - from which to choose at $3. Blanket Bection, Becond floor. Cretoune Pillows, Fifth floor, Cool, Short-sleeve Voile Blouses —make the happiest of compan- ions with 2 White Tub Skirts when it’s sum hot. Blouses, $2.95 to $4.50—Of fine | white voile, with low round necks, some with dainty collars, others plain, but adding a touch of val or Irish lace for trimming, and’ tucking-in or tying-on, as you like. Skirts, $2.95 and $3.95—Of white \ gabardine and suyf satin—for the most part smartly. tailored—with inset pockets or fancy pearl but- ton trimmings. Bkirt apd Blogse Bectiots, Teird floor. If Youare Goinz where there’s Water-- ANNETTE KELLERMANN Two-in-One All-Wool Bathing Suit, $5 —is just what you'll 'wapt. A new shipment brings many dif- ferent color combinations in this popular model—with V' neck and small cap sleeves, Bathing Suit Section, Third floor. On the Running Board OU ‘can carry-one of these automobile or picni¢ refrig- erators—they are splendidly con- . structed with mineral wool insu- lation—and fitted with an adjust- able ice chamber. Plenty of space left for the lunch—in two sizes, $9.50 and $10.50. b p.m.—Sport results. 3 ~—The Dstroit News Orchi Ella glnpf'—; ul, “Keep on Hoping: ‘way, tenor; Nicholas J. Schoon, speak- “Historic Sketch of Leatlher.” WBZ — Westinghouse, Meters—Eastera $255 ‘WWJI—The Detroit News (360 Meters). 9:30 a.m.—"Tonight's Dinner,’ talk by the Household 1 culture drills by’ 8:00 p.m.—Ljiterary evening conduct- Rival Has Stolen My 7 c : . —] 3 1 eten merican and Harper &| gU;% S o ROORCNuS ne Nov- o —Weather (485 meters). |11 scores. 9:15 p.m.—Concert by Marfe Bailey, °Ity Entertainers. demeer Stream,” Irish melod: 12:05 p.m—Music reproduced. ‘WGR—Federal and_Tele- planist. Miss™ Balley is re- —Base ball scores by in- |a Dungeon 30 p.m—Weather (487 meters). sraph Company, uffale, N. Y. . THE WHOLE FAMILY light-Saving Hour). 7:30 p.m—~Base ball scores; bed- time stories for children. 7:45 p.m.—Lecture and market re- ports. Time = Deduwet One and (Eastera Dayligh Deduet One Heur). Noon—Weather and market reports (485 meters). ther and market re- p.m.—Wi r | ports (485 _meters). —Base bedtime digest of day's 8 P'“L ball scores; stories for children; Day- | meters). . AN ELECTRIC FAN —will stir up a breeze any day— especially the R. M. Electric {u. Non-osciliating, 8-inch, $10303 10- inch, $17230; 12-inch oscillating, Housefurnishisgs Section, Fifth feor. COOLING OFF WITH AN ORANGE DRINK —will be doubly tempting when served from a daintily light cut glass covered pitcher. Complete with six glasses, set of 7 pieces, special, $2.95. TIREDNESS IS FORGOTTEN —when you lounge in an easy chair of brown reed fiber, with spring seat and back upholstered in attractive tapestry. A popular at Rocker to match, $23. Willow and Reed Section, Fifth floor. N THERE NEVER WAS BETTER ICE CREAM —than the home-made kind—and with a triple motion White Mountain Ice Cream Freezer your work is lessened. 1-gt. size, $3.283 others up to 8 gts., $9. Housefuraishings Section, Fifth floor. EVEN WHEN IT'S HOT OUT OF DOORS —the lemonade in your Carafe will be as deliciously cool as when you put it in—and will stay so for many hours. Nickel Carafe, 1-qt. size, $8. Thermos Bection, First Soor. P —will enjoy a Shower—it in- stantly fits into tub—no labor, no tools. Two different The N 8. 3 . The P:m:dl. $14. 14 ‘Housefurzishings Beetion, Fifth Soor.