THE NEW YORK SUN, SATURDAY, OCTOBER 29, 1932.

[Engineer Champions Mechanical Scanning as Best System for Progress of Television — • — , - I.I, i , , - . • , . • • • — „ . i„ .„ . - , „ • — • • • • . a , , - . . . ,*» - — • • i i - m

Circuit Diagrams for the 55

d Pay | i -

SOME OTHER ASPECTS OF THE EVENTUAL SCANNING METHOD lechanical System Is Ap­proved by One Engineer.

itball

i a - Pitt*. W A B c .

and Ted

loll, WJZ.

P I Cornell, loley, an-

B . C . , is do-•aday night | N e w York. 1 t h e smaller

has one or* uctors. One ssical musie le musicians I never know

i t H K i i m ,

he more lea. f t h e Middle a thlrty-flTa. • due on the ke BlngCro* it a standstill L hav* such a a f i lm actor, e S tree t Sing­es of movie arvin made • i sand Islands x hours . Ha* ,n border be-c lose up his W e apologise r a sl ip con' Is's broadcast d idn' t mate*

ho h a s been n N e w Jersey

w h o had to o f radio wri-r s ide of the

radio serial, i n t r y , " is be* W O R every

larkably good scripts . . . .

on t h e air via theatre In the tf t h e Pacific h a nut Grove. riub program, Bunday night o recommend len and Port* Roy Atwell of down to two is a sensible

rery funny for much of him

' s ight In some n d o w the day Dver is elected

pne writer and freed to shine V a n Steedea,

m e store wb> rats win then 0 t h e shining 'or particulars. rank and Flo"

B V D S .

ier i s president coa l company,

of the Booth m t h e air has wrest In other rs. . . . N.B.C. 1 addled Fritz

Jer i tza to its b o o k them for A g a i n no men-roadcasts . . . . r lem's Connie's flay and Thurs-Igrams via Co-;

Jrof • now worfc-isical eomp©e«-m a k e interest-

t h e m "Radio ind "Prologue pled Banner . ' "

objection. That a rotat ing disk is n o t an e legant piece of apparatus, that i t s speed control is difficult, wil l not be denied, but this is not enough of a concrete d i sadvantage to cause i ts immediate discard. A good motor driving a wel l machined or constructed disk Is s i lent and may be controlled in its speed with­out undue difficulty. Natural ly , on the face of it the ca thode ray tube, w i th i ts we ight l e s s , noise less , eas­ily def lected beam of electrons, is someth ing undeniably attract ive . A s a dist inct d i sadvantage , which m a y be classi f ied itself in the same w a y a s the mechan ica l objections l isted above , is the h i g h and dan­gerous vo l tage requirements . H o w ­ever, that mere fact is not enough t o cause one to discard cathode ray tubes .

T h e M a t t e r of D e t a i l .

Secondly, detail . I t h a s been oft said t h a t the d isk cannot be a m e a n s of adequate detai l ; that a s more image or picture e lements are desired, a n d consequent ly more

CATHODE RAY IS EXPENSIVE

Disadvantages of Rotating Parts on Way to Solution.

I I , I V A N 111.CM | | .

Tor the last several months t h e technical pr*M h a s engaged i n lengthy and s o m e w h a t heated d i s ­sertations on the relative merits of mechanical versus electrical scan­ning methods. The argument h a s leen distorted by a veritable pedan-|lc attitude on the part of those •feeterm themselves te levis ion en ­gineers in an art which has not y e t attained an engineering s tatus . A s la argument, per sc, the virtues of apertures the two methods offer unl imited c o m e s c i u m s y a n d large. In oppo-possibilities. as did the famous Mid- 8 i t i o n t o t h i s t h e c a t h o d e ray tube dUAces puzzles discussed at great offers the possibi l i t ies of unlimited length by archbishops, monks and i m a g e e lements . F o u r hundred and philosophical s tudents: "How m a n y . forty l ines why not 1.000 lines? N o angels can stand on the head of a

NEW TUBES AND THEIR CHARACTERISTICS—CHART 7

-10 -50

fin?" The author of these few words

has nothinc to Rain or to lose In a contemplation of mechanical a n d llKtrical scanning he Is mainly preoccupied in this one and all im­portant question: "What method or methods can be be^t used for the Improvement in all processes of tele-

one can deny the fact that a 440, or even a 120 l ine disk, i s a physi­cal impossibi l i ty , except to those who do not mere ly visual ize a s in­gle spiral disk, but see other means of mechan ica l s canning where the n u m b e r of image ele­m e n t s does not depend o n a number of holes or mirrors or lenses , but on

, some other optical method . vision0' He does not care w h e t h e r | However , i t is best first to con-he is limited to one or to m a n y a i d c r d e t a i i l n H 8 complete mean-ways if facts can be presented pro | } n , - . A n y G n e can s a y that the de-and con. and if such may be re- tail of a sixty-l ine i m a g e is poor. girded from the present possibil ity ! C a n a n y o n e p r o V e i t? W e see ex-«f usage and their value for future ; c e i , e n t examples of e lement, and development, then s o m e conc lus ions j thus detai l paucity , i l lustrated by

comparat ive photographs showing images made of 4,320 e lements , 8,640 e lements , A c w h i c h appar­ently prove that a s ixty- l ine (4,320) image just dosen't do. W h y is it. though, that the i m a g e ln the mon­itor panel of a good televis ion trans­mitter ha3 as m u c h detail if not more than a ha l f - tone? It may not

From the first viewpoint , one m a y | have occurred to m a n y that the e*«ily say that the mechanica l : manner of Image e l ement presenta-•jctBod hns certainly been used ; tion is a n important one and that

may be derived which in all humil­ity may also be discarded w h e n scientific practice s o dictates .

Any technical subject may be analyzed from three v iewpoints : past performance, present s ta tus and future development.

I n c c e * * W i t h M p f h n n l c n l I d e a * .

-60 -61

—10 THREE ELECTRODE POWER AMPLIFIER.

Filament voltage (A. C. or D. C.) 7.5 volts Filament current 1.2n amperes Plate voltage 250 S50 426 max. •Grid voltage —22 - 3 1 „ - 3 9 volts Amplification factor 8 8 8 Plate current 10 16 18 mils

*Grld volts measured from midpoint of A. C. operate! filament.

—50 THREE-ELECTRODE POWER AMPLIFIER.

Filament voltage (A. C. or D. C.) 7.5 volts Filament current 1.25 amperes Plate voltage 300 350 400 450 max. •Grid voltage —54 —63 - 7 0 - 8 4 volts Amplification factor 3 8 3.8 3 8 3.8 Plate current • 35 45 55 55 mils Mutual conductance 2000 2100 2100 micromhos Plate resistance 1800 ohms Power output 2400 3400 4600 milliwatts

Self bias Is advisable in all rases. The resistance of the grid coupling circuit should not exceed 10,000 ohms.

•Grid volts Is measured from midpoint of A. C. operated filament.

—80 FL'LL-WAVK RECTIFIER.

Filament voltage 6.0 volts Filament current 2.0 amperes A. C. volts per plate 350 400 max. D. C. output 125 110 mils, max.

Operating conditions with choke input to filter: A. C. volts per plate (max.) 550 volts D. C. output (max.) 135 mils.

This rating is permissible only with filter circuits having an Input choke of at least 20 henries. If desired a condenser of not more than X mfd. may be used across input to filter.

—81 HALF-WAVE RECTIFIER.

Filament voltage 7.5 volts Filament current 125 amps

Operating conditions with condenser or choke input to filter: A. C. plate volts ( m a x ) 700 volts D. C. output (max.) 85 mils

Full-wave Circuit « tubes). A. C. volts per plate (max.) 700 volts D. C. output (max.) • •> 170 mils

New Tube Offers a Wide Latitude in Pos­sible Tube-Unit Connections. /

3 4 AVC J*

r •"\***</>AeV»

in " C 3

Hr-- l

f l G . 1

FULL-WAVE OtTECTOR • F ' x t D - f t l A S

2 5 0 V

AMPLiriCR

A V C

•»—'V>£</VW »MV

HAtf-WAVC QCTCCTOR - FIXED-BIAS AMPLIHCR

AVC

*>»V»Jls*sVsa. B*

FI&3

HALT-WWE DETECTOR • SERRATE AVC. nvEO-BIAS Al^LlTlfH

H e r e is Chart N o . 7 w i t h information on the typo — 1 0 a n d — 5 0 p o w e r tubes , a n d rectif iers — 8 0 a n d — 8 1 . Deta i l s o f the t u b e c o n n e c .

t i o n . a c c o m p a n y i n g e a c h of theso t u b e s a r * those of tho s o c k e t w h e n the la t ter is v iewed from above . T h e e ighth chart in this

s e r i e s wi l l a p p e a r n e x t Saturday .

tube's physical d imens ions . A large tube would al low larger images , but t h e construct ion of s u c h a tube is not y e t even considered, as the tubes n o w used h a v e t o be made of a specia l g lass in order to with­s tand the enormous s train of at­mospheric pressure.

Re turn ing to frequency l imits for modulat ion, it has been pointed out t h a t due to the lack of ion mobility

life of the tube is very low as com­pared w i t h i ts cost.

A fac t l i t t le discussed by t h e ca­thode ray protagonists and w h i c h it seems should be invest igated thor­oughly by them i s : W h a t are the physiological effects of ca thode rays on the eye? Is It not possible that if excess ive accelerat ing po­tentials are used that a very harm­ful and penetrat ing ray or rays

neon l a m p s will not respond with i might be resul t ing? Before such a ins tantaneous f idel ity to rapid J tube Is m a d e available to the public c h a n g e s of Intensity. I t may be , n should be the duty of the en- T h e televisors prefer brunettes; said here that recent developments j g ineer to ascertain whether he i s ; blondes cause no end of trouble for

CONDUCTS VISION MAKE-UP TESTS

0

Televisors Prefer Black Lipstick and Brunettes.

W e h a v e fou©d that r e : i s of no avail , because t h e photo-cel ls that are used are of the potass ium caes ium type and are sens i t ive to blue. A s a result, red te levises gray. This is opposite to standard photographic principles in which red comes out black. Blue , inci

AVC

V a r i o u s methods for us ing t h e new diode — 5 5 tube .

in gaseous discharge tubes indicate g iv ing the public an ins trument t h a t th i s fault, toge ther with the whereby sight or other nervoua luck of intense Illumination, a r e ' function* might be impaired. rapidly approaching a satisfactory solut ion. (Refer to description of Myer's tubes.) Furthermore , the ampl i fy ing s y s t e m m u s t first be capable of handl ing those frequency ranges wh ich the neon crater lamp can take care of. I t is logical that n o mat ter how large a frequency range is available and how well it

the studio man , and a beauty dare not use red lipstick when she ap­pears before the broadcast cameras . Bright red bleaches to ashen gray through the televisor.

Discovery that blondes rank be­low their darker s is ters in television

Electrons are of no value in a radio tube unless they can be put to work. A radio tube is designed with the neces-

\ I sary parts to utilize the electron flow. These parts con-dentaiiy, photographs and teievises sist of a cathode and one or more supplementary electrodes.

The simplest form of radio tube contains two electrodes, a cathode, and a plate and is called a "Diode," the family

slight the beard it a lways shows n a n i e f()f t h e t w o e l e c t r o d e t u b e s , up ln television. Usual ly whi te I

black. Men m u s t worry only about their

lips and beards. N o mat ter how

powder takes care of this . Black lipstick completes the make-up, yes, even on males .

From t h e foregoing facts , one m a y then formulate some fair opinion which m a y be summarized a s fol­lows: T h e electrical m e t h o d s a s represented by the cathode ray I preference and that a perfect tube are a s yet great ly unperfpeted, i Cupid's bow is best produced by unavailable, costly and difficult to black paint on dainty lips was operate. T h e advantages are then- \ made after a parade of models had retical, but not a s yet practical . It 1 passed before the televisor of

m a y be reproduced at the light ; r e q u l r e 9 expensive associated a p - | W 2 X A B in a series of make-up source the intermediary equipment ^ ^ ^ w h l c h U s c l f h a s n o t | t M b , m a y render such detail supply j r e a c h e d any degree of eff ic iency. worthless . The cathode ray tube * _ . . . , . offers its diff iculties ln modulation. | , T h » . f " t u " * " . n d J . t o w a r d a " Theoret ical ly the beam should re- i * £ & * T S A £ ? w * « , " , e r * spond to as tounding f igures; ac- I w » l • * o n « u s i n * t h e / a t h o d e ray

A TOSCAMM GESTURE Conductor Makes Possible

Noon Organ Concert*.

Recent ly there appeared a "du-1 plex-dlorte a n d triode" tube in a single envelope. In operation the two diodes and the triode are In­dependent of each other except for the c o m m o n cathode sleeve, wh ich has o n e e m i t t i n g surface for the diodes and another for the triode. This independence of operation per­mits of unusual flexibility in circuit arrangement and design. The ap-

J. E. Smith to Talk To Service Men

With blondes,

A gracious gesture by Arturo Tos canini in set t ing his daily rehearsal I R a t i o n of th i s tube to receiver

. . . . .. „._... _ circuit des ign offers a wide lati-schedule for the Phi lharmonic S y m - , t U f , e | n p o f , s i b ] e t„be-unit connec-phony Society ahead more than an tions. Since the 88 really consis ts

explained Harry I hour has made possible a continua-1 of t w o diodes and a triode, each of

J. K Smith, president of the Na­tional Radio Institute, will discuss "Application of Theory to Service Problems" before the Institute of Radio Service Men next Tuesday evening at tho Hotel Pennsylvania. All service men arc invited to these moetngs .

tube is not certain.

The two s y s t e m s of s c a n n i n g a r e represented a b o v e b y ( l e f t ) the mechanical s canner or l e n s desk a n d on the r ight by the much discussed cathode ray t u b e . Each dev i ce has i ts adherents , but only t ime will tell which o n e is to b e c o m e s tandard .

tually it is no s imple matter . Modu­lat ion of the b e a m h a s been ef­fected In several w a y s , of which every one had its disadvantages: the spot of l ight would vary in size,

i the deflection w a s unsatisfactory, ! Ac. Great progress h a s been made > * * * • * » " U a U h o u R h

i in the solution of the problem but | f a ? h ! * > • » * • « • « • own advantages . has not reached a sat isfactory point i l i s . n * m a t t ? , r ° / > ' * « " • " g u -

Spears, its chief engineer, little of t ion of the Carnegie Hall free mid-the human face could be recognized until make-up w a s applied. P.ut w e worked wonders , he said, w i th the

the next f ew months , and perhaps application of a grease paint base years , w e shall find the mechanica l j a sun-tan powder, black eyebrow method In force. In that t i m e s o m e pencil, l ight green eye shadow, unknown development m a y take heavy mascara on the lashes and place wh ich wil l definitely point J black lipstick.

Brunettes , h e continued, give little or no make-up trouble. Whi te

as yet.

T i t t h o d e R a y e > - n v h r » n l * n i .

A* far a s synchronism is con­cerned, wi th the cathode ray tube, little h a s been said. Glib individ­uals maintain that it Is an easy matter to adjust the deflecting im­pulses so as to f rame and keep in

ment which will further the art , but tion

day concerts and the organ recital broadcast by W O R .

These oog&n recitals were in­tended, at first, to fill in the usual summer h iatus of good music and to afford noonday distraction to the workers w h o must remain in the c i ty whi le their fr iends and families were a w a y vacationing. They were inaugurated July 35.

I these tube units may be used in a ' circuit just as though it were in a [ separate bulb.

Since the diode is a simple rectl-I fier, it does not amplify. If in-c i e a s e d vo l tage output is necessary

j an auxil iary amplif ier is necessary. T h e d iagrams shown in F igures

j 1 to 4 i l lustrate the application of ; the 55 to typical circuits. Figure 1 ; shows a full wave detection and

Radio Exchange r".lRhlp»n nseCa n i ln ln iam. Wbtir -p»rr ar

M M l ines . Mr p*r a g a t e l ine.

or pink powder, black eyebrow pencil, light brown eye shadow and J existence these free c o n c e i t s have

ca lm and sensible c o n s i d e r s - black lipstick show off brunet tes ; grown to such importance in of engineering fac t s w h i c h I 100 per cent. T h e red-heads also ! the musical l ife of th i s city that Mr.

will br ing about a closer date commercia l television.

ln are in this class . j Toscanini refused to see them dis Black l ipstick is used exclusively. I continued.

*Mh greater success than the elec- j photographic compar i sons are mis­tical one. it i.i an older method, I leading. In a photograph as well M in i t . fundamentals has been as in mot ion pictures every ele- I ̂ "m; the "received" "image."" What is rented more thought, but actual ly ; ment is presented at once, and the th« experimental work expended eye is obliged t o scan this Rrent upon it has not dated much further , mass of e l ements in order to per-WX than the perfection of the , ceive detail. In televis ion each sin-g r t t e n and thermionic v a c u u m \ gle e lement is presented s ingly to I n o t " ^ " ^ " ' M W l s i " t o " t H s ' y a b » e MB, At best one may say that the the eye and it s e e m s that this s in- h a 3 c ^ e t e r y answered every re-»ge difference between the two gle and success ive e lement presen

tation creates a greater visual sen sation of detail .

GOT TO >0NS0RS

actually the case is not within the knowledge of the writer . In me­chanical methods it h a s been a problem, but a recent development

•Rhode is not more than five to ten years . • The most important discussion Is

ftat of the presest status. First , the public and the majority of the ffigineering profession have not

I . i m l t n l l o n o f K l e m e n l a .

There is no doubt that s greater number of l ines will increase the

Nations Are Carriers.

R i g h t s Reserves'. Oct. 29.—Bro*d> ive the right to

those who ap-licrophones, sad to throw open

111 comers alike price , according l l ing by the In-Commlsslon. rant of Jurlsdlc-sver to be rslaed {ht of • station •n down an ap->n the air, the ipheld the con-s d c a s t i n g Indus-ire, no t common rai lroads, forced

T h e complaint in a year ago by ucta Company of

jt t h e National Ipany and station ft. N . Y., alleging i s discriminated 1 contending that [ the Transports-had the right to

rates of staUoa* Jie a ir and othtr-

*»n any results obtained w i t h the available detail , but there are other governing factors which enter into the situation. T h e mention of 440 l ines cannot but be speken of a s preposterous. N o t that it will never be atta ined, but It is completely

Whode ray tube. It is therefore on a matter of hearsay that the ca­thode ray tube m a y be used w i t h peat success. T h e demonstrat ion ef P. C. A.'s sys tem using that tube

t o the eourti im's ruling U P , r* rse Is ImprobsbW DUS s tatement *T

Shine Company r>t w a s contei"*

accordlng 1 0

„ c h a n g e In tht Seastlng station! ity common car­om Congress i n *

and ?ho%vn to l icensees of the corpo- a n c i thoroughly Utopian In concep-Tatirni was deemed excel lent by the jt ion and h a s not the sl ightest basis majority of those fortunate e n o u g h I for present considerat ion. A sixty-to see the apparatus in operat ion, j l ine sys tem, 5 by 6 image ratio and However, the demonstrat ion w a s in j twenty frames per second, requires tho hands of experts and the ap- a receiv ing and transmitt ing sys-atratus certainly was "tuned u p " i t e m capable of handl ing without dis-for the event. The Phi lco -Farns-*orth s> t<m has also been cal led •sWllcnt In neither case can the fchlir dare opine.

•a the other hand, the mechani -••1 system is no secret; it hn.s been UMicizcd, it has been demon-1 is an amplif ier of unsat is factory totted under all kinds of c ircum- { frequency character is t ics at the re­

ce iver or at the transmitter or a t both. A 120-line sys tem's range is of 20 to 170.000 cycles. A 240-line s y s t e m ' s range is from 20 t o almost 700,000 cycles . A 440-line

complete ly answered every quirement . I m a g e s from as far wes t as Indiana h a v e been suc­cessful ly received a n d "held in s t e p " without any attention on the part of those looking in in N e w York. Th i s Is o n e of the major s teps In televis ion progress .

At the transmit ter one finds the mechanical m e t h o d s used every­where . At tempts h a v e been made to use the cathode ray tube as a s c a n n i n g adjunct , and in the use of motion picture fi lm It has been suc­cessful. However , a t the present t ime it cannot be sa id that the elec­trical method can compare with the mechanica l one .

Tost an i l V a l u e .

T h e matter of cost , production and commercial va lue has been greatly underest imated by the av­erage worker in televis ion. The lens disk requires a'Rlfflcult machining operation, and consequently has not

TELEVISION PROGRAMS FOR THE WEEK T O D A Y .

W 3 X K — W a s h i n g t o n . Sight nn ) Snurtfl nn

1 4 ; m e t e r s . W. ix . l 10.1 m e t e r s .

<1 no t n 10:00—Film presentat ion . 10 00 to l l : 0 0 - D i r e r t pickup.

W 2 X B S — N e w York. Sight nn I N o Sound .

14.1 meter*. 2:00 t o 5:00— Experimental p r o g r a m s .

W I X A V — B o s t o a . RlsVit on Sound nn

179 meters . W l X A t ? M meter* .

*.:<*» to * :0A-Kxper imenta l p r o g r a m s . 9 :00 t o 10;00—3krtrli.

W 2 X A P — W a s h i n g t o n . S i g h t on I Sounrt o a

147 meters . W 3 X J I 1!».t m e t e r s .

(1.00 to fi:»>C»— K r p e i i m e n t s l Images . 8 :00 to 9 : 0 0 - i J i n - c t pickup.

«*»nrrj with all Its own and those (Wen ; originating in necessary np-JHirter-inrcs. N o matter h o w poor JJr how Cood it h a s been, i ts results cave ^rm seen.

Let llfl n o w approach all cri t ic ism j sy s t em's range is from 20 to over ! at the mechanical method ! 2.000,000 cyc les . And yet such a

sys t em Is spoken of for greater de­tail! Therefore , this seems to pre-

•nd are how or whether the electri *»l rnotnods overcome those diffl-•tiHir.-!.

*rr n l f f l r n H i e a O v e r e n m e t

*lf"l of all, mov ing parts. In all feerh miral methods some part

T h f .

seme

Kn iTir!1

•fttki

Art ,-, H O T l r ,

TTH,- |,

fce f |e | i • mr , i htit . a tb'

i"? If it is. then all home n picture projectors should garded as antiquated, inef-

ind clumsy. Consider the m of the projector: ro-

• "i'ket«. osci l lating cams . n ribbon nf film travel ing In

Mterrupled fashion and at high

cr iminat ion frequencies of roughly 20 to 50,000 cyc les . Most amplif iers require much thought and care in design to handle even in a poor w a y that frequency range. T h e mos t frequent, cause of poor Images [ j j ^ , i rva lJaMeata | s j n w n , B ) t arret"

Mass production h a s been impossi­ble without a heavy initial Invest­m e n t In cost ly drills. An effort has been made by one manufacturer to produce a c h e a p and accurate lens disk, but the cost has still been too high. At the present t ime a method has. been devised which a l lows mass production of excellent lens disks of any s ize or description and which will result ln a ridicu­lously cheap disk. The driving mo­tor has also been an expensive i tem, but wi th the advent of th i s d i sk a cheap synchronous motor can be used, a s the disk we ighs but f ive ounces and h a s little windage.

T h e cathode ray tube is a most cost ly piece of machinery. A s mentionel heretofore, the tube must be mechanical ly s trong to with­s tand the e n o r m o u s pressure on its wal l s caused by the difference be­tween its Inward pressure and at­mospheric pressure. The e lements sealed within must be lined up most accurate ly and m u s t withstand the necessari ly h igh voltage. The fila­ment or heater must be so con­structed and so placed as to con­t inue with a plentiful supply of electrons w i thout rapidly disinte-

TOMORROW. W 2 X A P — Washington .

5 00 to e, ;ffl—F.xp»i lm»ntsl program*. 8:00 to 9:30— Direct pickup.

elude any m e n t i o n of the re lat ive values of detai l reproduction be­tween electrical and mechanica l s canning methods . W h e n the elec­trical amplif ier sys tem is capable

• t a n rotates or osci l lates. The j o f handl ing larger frequency l imi ts r*"1 f motion is high. A motor or it will be t i m e to consider t h U fip' irj magnets are used. Unles s j Present argument .

""a-itions are taken, noise results . | T h e mechanica l methods require fore, it may be obvious to* j an easily modulated source of l ight, thai this In Itself is a com-I T h e neon lamp, the Kerr cell and indictment, for the electrical | other means h a v e been used. T h e i uses no mov ing parts, l ight from the crater lamp is not,,

no notee and operates ' great , but it suff ices for images u p hly tthi* supposition is made) , j to ten feet, a s Mr. Sanahrla snowed .

. is a moving part so oh- For the h o m e , images 10 by 12 Inches are sufficiently brilliant to be seen in semi-darkness . On the other hand, h o m e motion pictures are usual ly v iewed in locat ions much dnrker than those required

W 3 X K — W a s h i n g t o n . A.OOtn tShnft-Ktlm prveentatlott.

10:<jO lo I I :<0-r>iiert pickup.

M O N D A Y . W 2 X A B — New York.

Sight on I S.>uni1 on 107 meter*. ennie w a v e .

•. :0O—Tele\ l*mn Slm«t. S'.IK—Plane tc**mis i.v r,. AIHO rumicfger. S:.-,o— Jack t'ei»T»i.n, ukclele. R:ta—Correct tmu-. B:.-«-Wlrte. Wo, i , i r t .v lew. reuni t ing J « c k

F leming end plav»r*. ft: I ' . -Kt l i c l Anion , eotic«. 9:3<w Muriel A*che and Iter Klng*\<»>

Kiddle*.

W 2 X B S — N e w York. 7:00 t o 10 0 0 - B x p e r l m e n t a l prng i s rus .

W 2 X R — N e w York. 5:05—Rxperlments l p r o g r a m s . 7:00—Cartoon*. S:n0— F i l m s wi th sound. 8:00—Cartoons. ,

S O N G R E C I T A L Rete l l* Sydney . 8:45—Musical l ' a* te ]* .

W 2 X B S — N e w York. 7f:O0to 10:<>0— E x p e r i m e n t a l p r o g r a m s .

for the d i m m e s t television Image. t grat ing under the bombardment of The cathode ray tube, according , posit ive Ions. Furthermore, the to reliable sources , is very sat is far- j f luorescent screen becomes less

Ar I vet no one I lory In bri l l iancy characteristics.. Tt. | f luorescent after continued electron curly regarded this a s an however , is l imited In size by the impact . W i t h these factors, the

W 2 X A P — W a s h i n g t o n . S:00 to n n o - n i r e c t pickup. 8 .00 to 9 00— Direct pickup.

W 3 X K — W a s h i n g t o n . o nrt to, it» :no—Film preeentat lon .

10 W to 11 (Kl-Dlrect pickup.

W 1 X A V — B o s t o n . 8 : 0 0 to 10 00— Rxperlmental piVttlaSJIS,

T U E S D A Y . W 2 X A B — N e w York.

S no— F s ' l u o n *how. r,l«d>* KShn. 8 15— Hahy, Huth t'arkin, <i*m« mid song

ac t . 8 2.1—Correct t ime . 8:,'tO—f'eRgy So»nneck«en, p iam«t . 8:4.i— S o n g s . Sy lv ia Sherry and Paul Meer-

swtts, » Oct o n e man lax* hand, Vincent Mondl. • •IS—Onetda W r l a h t . the f l o w e r Olrl . B;;*0—Thret-round boxing bout . B l o w by

Helen H a y n e s appears in a n e w program over W 2 X A B on Fri­days at 9 : 4 5 P. M.

blow descript ion hy p ick Msd*o on sound side of s l eht hunt!.

8.4V— "1'htslc al Cul ture , ' Tommy Madden.

W 2 X B S — N e w York. 2:00 lo D 00— i:.\peritrtetital p r o g t n m .

W 2 X R — N e w York. S.nO-FvpetiniPTilal progtamx. 7 .00—Cartoon*. 8:00—Films wi th aound. 9:00—Cartoons.

W 1 X A V — B o s t o n . 8 :00 to 11 :00—Experimental p r o g r a m s .

W 3 X K — W a s h i n g t o n . ft no to 1OO0— Kxpe: lmen1sl film p r o g r a m s . 10 INJ to II .00—Direct pickup.

W 2 X A P — W a s h i n g - t o n . S ; 0 0 t o « n o - D i r e c t pickup. 8 .00 lo 9: ( iO-Dl ic<t pickup.

W E D N E S D A Y .

W 2 X A B — N e w York. 4:C. Marten K, Pew. tsiv. H.i«» Strange People, talk, l l enr i c t i e P u n

lap. 8 I", Correct l i m e . 8 10— C u t i v V o s s , dancer . 8 -W'- i iket ' l iea . 8:4."i—Henntor N u m b and h i s "Otsf-

f a n Ian.*."' p 00— (Jcoige P r l t l o n . songs , • l."> Dramatic- s k e t c h , fane Jnnann and

l , a » rcne* M'-nkln. 8:30—Dramatic pantomimes, featuring

During the short period of their j automat ic v o l u m e control with the triode-diode biased. R l is a re­sistor of .5 megohm shunted by a condenser Ol approximately 150 mmfds . capac i ty for the broadcast frequencies a n d approximately 600 mmfds . capac i ty for the usual in­termediate frequencies. The load res is tance R3 is not critical and may be about 100,000 ohms.

Figure 2 s h o w s a full wave de­tector a n d automatic volume ar­rangement wi th a fixed bias triode. R4 and C2 are approximately .5 m e g o h m s and .01 mfds. respec­tively.

F igure 9 shows a half-wave de­tector and automatic volume con­trol a r r a n g e m e n t with a fixed bias triode.

F igure 4 s h o w s an arrangement whereby one diode serves as half-wave detector , the other diode as automat ic vo lume control tube and the tr iode a s an amplifier wi th a fixed bias .

In the above diagrams, with fixed bias applied to the triode, trans­former coupl ing has been shown. This arrangement , however, Is not recommended for the "diode-biased" c ircui ts .

PARTS AND EQUIPMENT A L A N it A D i n c o n p .

F o r n n Replacement P a r t s . M Cotiian.it St. BArcla* "Mies

U K r .^.Y.V: : M , ' : N T P A R T S A nF.PA!Rmo TRF.MONT R A D I O S E R V I C E CO..

r v v K S T TRKMONT A V . n n O N X * — ' ' "•• • - • • ' • ' I i — i ••aSJSaaSasaafJ)

SERVICE AND REPAIRS

W 2 X A P — W a s h i n g t o n . R 00 to 8:00—Experimental program*. 8 :W to 9 CO—Direct p ickup.

W 3 X K — W a s h i n g t o n . ft no to 10:00—Film p r e s e n t a t i o n .

10:00 to II ;O0— Direct p ickup.

W 2 X R — N e w York. R:0O— E x p e r i m e n t a l p r o g r a m s . 7 ;otk—Cartoon*. R:00—Films w i t h sound. 9 00—Cartoons.

W 1 X A V — B o s t o n . 8:00 to 10:00— E x p e r i m e n t a l programs .

T H U R S D A Y . W 3 X K — W a s h i n g t o n .

9:00 to 11 :00— Fi lm presentat ion* .

W 2 X A B — N e w York. 8 on— Pong*. Connie O'Nei l l . 8: ir>—Charnctcr s lant* . Mob D a v i s . 8 :,'SO- Marlon Hat n e k , d a n c e r . s i : . — S k e t c h , . lohn f», H e w i t t and player*. ;i on—.lack Snecd . g u i t s r . 9:14—Correct t ime. • :!.%—Chalk <hat*. f^in Hanlon.. 9 ,'IO— P.urnett alSterS, eonp*. 9 :4,'j— Helen I l a y n e * , song* .

ItADItvs KXt IIANC.KD, R K W I R E D : CON-V K R T E D \ . c . T O D. c . - D . C. TO A C.

til XU.WTKKU ltKM ITS M I M U I M fOSTS 8HMONA R A D I O S E R V I C E . INC.

(SB \ v . t j M > ST. B R Y A N T n JS81 M C 1 I T A N D P C N D A V SF.RVICB

F R B K SJERVICSJ C A M . C H V S E R V I C E RADIO CO.,

t i l l S'wxy, WAtktni 9RI1I. WAd^wnrth I 19JS

AMPLIFIERS K'lR A M P L I F I E R S Public Address By*.

tent* for Sw n o m i n e Pool*. Hal l* . I n s t a l ­lat ion* In truck*. JHIVEI, RADIO CO., 1 10 (•lianiber* at.

TESTING EQUIPMENT S U P R E M E AAA-1 D U g n o m e t e r . new port -

alde t e s t i n r lahnratorv . reasonable , E R N S T . 12.14 s». L a u r e n c e a v . , Brong . Tel . TNderl i l l l J| .r>M.

WANTED W A N T K D - M n i ' O A OR MR32 N A T I O N A L

T I N K R . c, R. ( J I F F O R D . 2302 VALES'* TINK A V . , B R O N X .

PUBLICATIONS i

Melody Moments Change Time to Monday Night

T h e half-hour concert conducted by Josef Pastcrnack under the title of Melody Moments will he heard hereafter on Monday evenings from o P,0 to 10 over WJZ. Next Monday the guest nitiPt will he Allan Trior, tenor.

TIIK R A D I O C R I T I C , ptthllahed m o n t h l y , te l ls Which an- programs del iver enter*

talnoiont and v ice v e r a a - n n d whv . A l s o rnntalne h u m o r o u s mater ia l for radio a r ­tist*. | t for ii month* Single copy 80c . 4<;."i So . Detroit a t . , IxM Angc|e« , Cat ,

SETS EXCHANGED A. c . for D . C.

• K N c H A V i K I T Itllvant 0 ISSO

D. C. for A . C. R A D I O SF.RVICB

K.7 West 42d S t .

SETS RENTED Seti i : Month •ntfd hv D a y , Week or

.1. St, MrfR'IRE # co , r.in \ v r it iago, i .,• \ \ . 42D ST.. N. Y.

W 2 X B S — N e w York. 2:00 to ,". Ort— Exper imenta l proKtaio*

W 2 X R — N e w York. r, no— K,p»r lmenta l p r o g r a m s . 7 uo—Ortoona . g on—Film* n l t h sound . 8:00—Cartoon*.

W 2 X A P — W a s h i n g t o n . S o n to 8:00— Direct pickup. 8 00 to 9 00—Direct p ickup.

W 1 X A V — B o s t o n . 8:00 to 10:00- -r .xpe i lmenta l Images .

F R I D A Y . W 2 X R — N e w York.

S ftO-Fxperlmcntal program.*. 7 :00—Cartoons. S on—Films *tllh sound. 8:00—Cst toons .

W 2 X A B — N e w York. * 00 Phi! and her uke. 8-I .V-Comlr a t i lp . f l eorge Kelt lng. S-30—Rohert M i f i e e h a n , c a r t o o n s . 8:4.".—"Spngheit s u d Rav io l i ," Italian

comedy leant 8 :0n—ssngs . (Hattys K a i m . 8:1">—Songs, ( iosal ln Bis ters . 8.30— D s \ i d R«m*de! l . h a r v t o n s . 8.4rH-Foothall Interview*. Char les 8ps«r.

Wiajit OuA Mat

10 inch COLONIAL SPEAKER

.95 tY T, 54" Pir^h rnlt. Thi« n t n n t i i l l v

« l.-iir, uiHtiat't'T*««| rr-t»rntluci mn, J' r h ( *!A Uirii |tl , , , . '1

AUDAK CHROMA­TIC PICKUP No. 20

Here I* a genuine.** m

.25 V I

I * S i.. I ' iMl . f

d a k Fbeofnal Pickup at art n Iremrl* i » prlrt While Ihey |s«t tt„. price, |*«« volmii,' 1 1 ml, 1* .

'4

CONSOLES .95

•grafles sale on ti"0le« Floor •»tn-

sees, EartneM en-afl. 'i»n. He»1 l-argalns A* Vim *«.

Mere are a 1rw examslrt ef «uir

BARGAIN C0UNTIR SPECIALS:

(A) r'lrndon S mfd

denser* JW \ >n i>. c . 'Ill I .I as II.. itntl

- I'I mni , i,,„ •:« vatt . 1 • m ..1.111 1 e s t t . , ,

• i ) I.MI.II \ . .!- , , .• In . i t . r - A«*td Iki ,v ; , « t t |

W 1 X A V — Boston. 8 00 to 10 OO-Kxperlmental p r o g r s m s .

W 2 X A P — W e s h i n g t o s u 8 SB to g 80— E x p e r i m e n t s ! preagragS I.OO to 8.00— Dirsct pickup.

j 1,ML. PHONt OB WFllTl fOR NIW 1011 I .ATAL0I.- ABSOLUTE LV Wf.t

, • m aBaaMasBal SS »i 81 aaaaaSBSS^^aamr-fSjl '100^

AVE: ( AKA1

r*?l^»1taie WAi M R S-8883

YORK.

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