CAPS MAT OOUHTT TUCKS SEA ISU COY, W. 1.

MABDICRAS MYSTERY bg ILBedford'Jones Illuxiration# by Irwin Mgen

CorrH* lard approached them, chockllnr to himself and lookia* hopely relieved. “Ha. Lode! dalndJ yoor favor jotT" Rememberin*. the *trt caaght at bar Ortoa of deUfht ware arlatag on a& aides hant tor Mardi Gras! Proa the heart of la her hand Lode removed a brooch of old Ulgree watt

CHAPTER H—Continued. oT the girl smiled - Bttie. “70a mold betray yocr bnslnesi Mends la rder to make a bit of moacy tor Halliard atared at her. “Well. If put It that way. yea! Td do more a*n that for " “Ihaak yon." she Interrupted, her olce cold. “I don’t think Td trusi ugadty v«y far, Robert. GoodShe tamed tr«B him and was gone, Ddnp throogh the great rooms like Colnmblne. Midnight neared, and bronght a cento many; the Midnight Master gained hie name by Invariably ppearing a momeiit or two before the iroke of twelve. Jachln Pell. ided hU time between enjoying the noting room and wandering about perceived that

A large man. stern and a bit aeomil of look, Malllard was ImpoMng ither than handsome. Ha appeared t typical banker, ef sentiment. Amased by the man’s idem uneasiness. Jachln PeU kept n In view while agged. One might have thought a: the UWe gray man was studying

idles a _ _ _ Shortly before twelve Colunibloe netted op to Pell and accepted the 1 he offered her. They were for a comer of the

peart!" She tamed to tea the no longer masked, but now faring at her from a frank, laughing countenance sdll partially veiled by brown cowl that waa drawn op done about hi* bead “Henry Gramoot “Oh, I half

n ware not aarer be “ToeYe not offended with

e. Luder

“I should be." She toeaed her bead. Ton were Impertinent. M. ie ^tnce“

He

aade a distasteful feature.

“None of that. Lode!

don’t like it— -Oh. la. lar le prtpee la a pas? He has

rich wife. Is It notr Gearnout's face lad

Toa know I

CHAPTER The Bandit.

Joseph Halliard's library was oa the ground floor of the bouse: tt was a sedate and stately room, and was Invariably abut off to Itself. Not «v«a tonight, of all nlgbts. waa It thrown open with the remainder of the bocaa. Here Malllard doxen of his pc friends, after the stroke of midnight had assured him that there waa no danger to be expected from the bandU. His sou was not among he mn»ber. The half dosen were nearly all elderly men. and. with the exception of Jachln Fell, all were men of promi-

nent affairs.

About the table grouped Malllard and his guests. Malllard. Branding before a small wall safe that flanked the open hearth. Ufu-d Ws stiver goblet,

asteam with beads. The moma which he bad been waiting was

be launched his little .hunderbolt with

an air of aaUnfled Importance.

-My friends. I have a confession to maker be announced. “Today I received a note from the Midnight Masquer stating that be would be with us h>i« evening, presumably at the hour

of midnight, his usual time."

These words brought an instant silence. The half-dosen men were tense, watchful, astonished. Bn. Halliard swung up his silver cup and

laughed gaily-

-I took full precautions, gentlemen.

The hour of danger U past, and the notorious bandit baa not arrived—«oc. tf be has arrived, he la nowin the h.ndt of the law. 80 op with your cupe. my friend*-* lifelong healthjo Mardi Gras, and damnation to probiw-

tioo and the Midnight Masquer'" From everyone broke a '

to the toast a murmur of relieved tendon. The sl'rer goblets were lifted, touched In s musical clinking of edges, and the aromatic breath of JiMepa Ailed the library as the drickera. In

of men before him with :<* threatening mouth. “Not a sound, if you please." he warned, his voice thln aud nasal—obviously disguised. “I trust that none of you gentlemen Is armed, because I am very quick on the trigger. A very pleasant surprise. Halliard? Ton'd given me up. eh?“ For an Instant no one spoke. Then V'..,ard moved slightly, moved his htad toward a button set in the wall near the safe. The voice of the bandit leaped out at him Uka thin steel: “Quiet, yon fool 1 If you touch that button " Malllard stiffened, and gripped tbs table edge with his shaking hand. The bandit bowed slightly, and addressed the gathering In a tone of dry raillery: -The rights of property are to »e lore sacred than human U«e; there I agree with the law. Se. gentlemen kindly empty your pockets op the table." HU voice became crisp. "The jeweled scarfptns which you lbcel red aa favors this evening may be to the collection: otherwise. I shall not touch your private posseeslans. No watches, thank you. Malllard, kindly begin! I believe that you carry a wallet? If you please.” The banker could not but obey. His bands trembling with fear and rage, be took from his pocket a wallet and emptied a abeaf of bOU upon tbs One after another, the other followed his example. When it his turn. Jachln Pall draw a single MU from Ms pocket and laid

CIRCUIT WITH GRID LEAK RESISTANCE

fakes Place of “C” BatteryHow Impedance of Flow Is Determined. Pig. IS sbowa a set of curves for three-electrode vacuum tube circuit containing a grid leak reaUtanca as shown In Pig. U Instead of a “C" battery with the same symmetries! alternating difference of potential applied to the grid circuit ra being no "C battery potential applied to the grid, the grid In Pig. U te nocma'ly at aero potential with respect to the filament. As the positive half of the first cycle of the alternating difference of potential Is ssed upon the grid circuit—see Fig. U—the grid U made positive

“If You Don’t," Waa tha Cool Threat. “I’ll Shoot You Through tha Ab-

agmlnr

T hardly believe so. atr.“ answered Fell in his apologetic faaHou. “lour

disguise is really excellent."

Tnank you." . The bandit’s voice tld a thin mockery. “Coming from

would soon collect a sufficient negative charge to reduce the plate current to aero and the tube would ceaaa to function. A grid Irak haring too low resistance will not allow a sufficiently high negative charge to collect on the grill, resulting In a very small plate current reduction and weak response In the telephone receivers. On the other hnnd. If the grid Irak la of too high resistance. t.«o high negative dtargt will collect on the grlil and the condition of no grid leak will be approached. In any electrical clrcnlt that baa _ difference of potential applied to It, the current that will flow depends upon the “Impedance" of that circuit; Just as In the flow of water through a pipe, the quantity of weter that will flow when any given pressure is applied depends upon how much the flow through the pipe U Impeded by the friction of the particles of water against the sides of the pipe and against one another. In the electrical circuit, the relation between these three quantities la that the current which will flow Is equal to the applied differences of potential divided by the Impedance where the current la in amperes, the applied difference of potential U In volts and the Impedance In ohms. On

Awy BCy

wlu respect to the filament. Being positive with respect to the filament, causes a certain number of electrons, which are negative charges, to bp attracted and caused to give up their negative charges to the grid. During the next or negative half of the cycle of the applied grid potential the grid Is made negative with respect to the filament bnt does not lose the electrons again. Thus a negative charge la built up on a grid during the positive portion of each cycle, the cumulative effect of which is to produce a decrease of the plate current, during the period that the alternating difference of potential railed a wave train Is applied to the grid. After the alternating difference of potential applied to the gild has ceased, the grid does not immediately lose Its negative charge. The Arid Irak forms a high resistance path for the negative chair*- of the grid to leak off down to the filament slowly. If no grid leak were used, the grid

BUZETTE AND BOMA For a long time Suxette had grieved, but she tried to forget her grief as best she could, for she knew how badly It made Boms feel,"

Daddy.

“Suxette, you remember. Is a Ch'.mponxee. She lives In a boo and Roma Is her ioring mate. Boma thinks more of Suxette than anything In the world and when Suxette Is in trouble Boma ran hardly bear It. “He would rather, far rather. Buffer himself, than have his dear Suaette Buffer. And oh. her grief did hurt Boma so! He cried to see hla Suxette In trouble. “Boma la polite to the other animals Fanny la another chlmpanaee In the xoo. Boma Is polite to her. He would not be rough to her. nor would he hurt her. but he doesn’t rare In the least about her. Fanny could be In trouble and Boma would feel sorry as be would fur any creature In trouble but It would not hurt him deeply aa It does when Suxette Is la

trouble.

“He will put his arms around Susette and hold her closely to him and will tell her how he loves her and always, always. always be happy. “If Boma cries they know what It means In the xoo. They know tbsl Suxette lx suffering or Is In trouble. He has been known .0 scream tod yell so that be waa heard almost a mile away. “Oh, such screams and such yells as he gave when Suxette bid such great- grief. “He could not bear Snxette's suffering. He wanted the xoo men to come and see what they could do. “Ton see Suxette had lost her dar ling little chlmpanxee bai.y. It l.«d not been strong enough t> live and Suxette cried piteously. “Boma had been so proud when the little chlmpanxee had been bom. “Then he had screamed excitedly with Joy and pride and everyone hid known from hla voice that Boma and Suxette were amazingly, wonderfully

happy.

“But then the Utile chlmpanxee had not been able to live. The

rhlch

transposing this equation the Impedance is equal to the applied voltage divided by the current. The Impedance of a vacuum tube plate circuit. Internally between the filament and the plate, when the grid Is at zero potential. Is an Important constant of a vacuum tube and Is railed the In-

ternal plate Impedance.

The Internal grid Impedance of a

vacuum tube used in a radio set as ' strength was not In Its

a detector determines the Impedance of the telephones that will give best results when connected In the plate circuit of that particular tube. It Is then m t only the resistance of a pair of telephones, bnt also the indoctance and the distributed capacity of the winding that cause the maximum current to flow In the telephones for a Riven change In grid potential The Internal plate Impedance of a vacuum tube varies only slightly wltt different plate voltage. It Is more an Inherent characteristic of the tube which Is determined by the design.

was so precious to Suxette and to

Boma.

“Oh. poor Suzette’s chimpanzee heart seemed broken. And Boma walled and wept that such sorrow

should come to bis Suxette.

“It was for her that he srffered

most."

“•My darling little ma’e. my loved mate!’ he cried, as he held Suxette dose, ‘don’t fed so badly. Boma can-

m the fragrant mint. Then, as the cp. were lowered, from the recess of

curtained windows at one end of the room came a qulet_voice: -I thank you. gentlemen! But I

tnurt remind you. Malllard. that there

*as not a time limit set In the note. With a simultaneous gasp everyone

tnnu-d. Malllard staggered: his face went livid. Every eye was fastatoed upon that amazing figure now advancing from the shadows of the recess

It was the figure of an aviator, dad

In leather from top to toe. the goggles ej»d helmet shield completely masking Ms bead and feetnree from recognlrt* In hi# hood he held an auto.rt. M* .H'MBMUBlfliBfa

“What the devil does the fellow mean?" exploded Judge Forester. “Then yon are hot aware that Mr. Fall is a man of large affair*r The bandit's white teeth flashed In smile. “He la a modeat man. this attorney! And a dangerous man also. I aassra you. Kit crane. Mr. Fell. Fll not betray you." Jschln Fell obviously did not appreciate the pleasantry. HU shy and woo-, dering feature* assumed * eel and hardened look. -Whoever you are." he responded, a subtle click of anger In hU tone, "you shall be punished for thU!" “For what. Mr. Fell? For knowing too much of your private affairs?" The bandit Uughed. “Fear not—I am only an amateur at this game, fortunately! So do your worst and my upon you! Now, gentlemen, kindly withdraw a few paces. All bnt you. Malllard: Fm not through with

you yet"

The automatic pistol gestured; under Its menace everyone obeyed the command, for the calm assurance of the bandit made U eeem extremely Ukely that be would use the weapon without compunction. Th’ men withdrew toward the tar end «' th* room, where a word from the aria tor halted Malllard remained standing where he waa. The Masquer advanced to the table and gathered the heap of money and ,earfplr« Into the leathern pocket of Us cost. During the procesl his gaze did not waver from the group of men. nor did the threat of his weapon lift from the b-nker before him. -Now. MaU'ard." he quietly ordered, -you will have the kindness to turn around and open the sail safe behind you. And don’t ton .’i »be button." Malllard started “That safe! Why—why—d—r. yon. m do nothing of the sort!" “If you don’t." was the cool threat. Til shoot you through the abdomen. A man fears a bullet there worse than death, it may kill you. and It may not: really. I care very little. Von— ,-ou financier T" Boom leaped Into the quiet voice, acorn that lashed and bit deep.

HEW RADIO FILTER A MARVEL Campbell Device That Separates TeU-

A1 though much has beefl said and written about the remarkable filter* employed by the telephone lines and by advanced radio workers for the separation of telephone and telegraph messages, says the Scientific American, It remained for Dr. Frank R Jewett, dflef engineer of the Western Electric company, to demonstrate how the filter permit* of transmitting radio telephone and telegraph messages simultaneous!}-, and of separating these messages at the receiving end. at a meeting of the American Institute of Electrical Engineer*. The present electrical filter Is the Invention of Dr. G. A. Campbell, a telephone engineer, hnd makes It possible to separate the various frequencies at which the Individual telephone and telegraph messages are carried. The detected electrical current a radio receiving set Is passed through the filter which separates the frequencies of the telegraph message from those of the telephone. The filter differs materially from the ordinary tuned circuits familiar to the radio enthusiast, since It separates not single frequencies but band* of frequencies of any predetermined width. The filter makes it possible to separate the band of frequencies comprising the telephone message from the band comprising the telegraph message. It can also separate one telephone message from another.

“Ground Antanna*."

Some relief from bothersome radio ••strays" In summertime can be obtained with set* having g<.«l amplifiers by using a “ground antennae." Tills is a long Insulatec wire run in a shallow tn-neb or 00 the surface of the ground. The ground " ire should be ran in the direction of the station from which *he moat signals are to be received, and should preferably be sev-

eral hundred feet long.

To a«BUlatt Wava Lengths.

A variable condenser when properly connected In the antenna circuit may be I *ed either to lengthen or shorten the wave length range. Beside* this, the degree of regulation Is much finer, for at best the loading cod can tune in only to within a single turn. If a loading coil of the tuning

Uitypau**.

SPARKS When our concerts come over ie “wlred-wireleas” and we plug Into the lamp socket, light music will be given added popularity. The railroads recently broadcasted a safety message from stations In Pittsburgh, Chicago. ark «-'d Springfield, Mass., calling attention to the fact that 84.00U pejple have been killed or Injured the Inst year In this eoi-nlry while trespassing on radroad property. if you do not know the code and wish to receive messages, there Is a device on the market at the present time which records the incoming signals on a piece of paper. The paper may be then read at the will of the operator. This method gives the person unacquainted with the code the privilege of hearing from stations which would otherwise pass over in the usual "buzz, buzz." style so unintelligible to the radiophone fans. While lying in the harbor of Iqulque. Chile, on the west coast of South America, the radio operator of the steamrhlp Santa Lula* clearly heard the entire broadcast program of Station WJZ. Hie distance separating Newark's station from the steamship In an air line was 4.000 miles. Ax a rerflt of the widespread interest In wireless telephony one mannfacturer has brought out a set of six double-faced records for teaching the telegraph code. Many persons, after listening to the radio-tele-phone concerns, have tuned In and heard the familiar “buzz, buzz" of the wireless telegraph messages being sent. Curious to know the meaning of the sounds they have cast about for some means of learning the code phonograph records The Canadian government Is considering the question of the umatenr radio field. Present plans are to allow The amateur using spark trumnilsslon a wave length up to 200 meters while those using continuous wave transmission would be ; permitted a wave length up to : 250 meters.

His Arm Around Suzatte. not stand your pathetic, beloved fee*.’ “So Burette's crying stopped, for she was very brave and only a little aad Lining note came In the place of the >bs. “Soon she stopped those, fof the keeper had almost cried, too. as be had held out his empty hands and had said: Suxette, pet. your baby isn’t here any more.' “Tea. she knew she must be brave. She was only making others suffer an. “And there was Boma! Oh. yea; there was Boms. Dear, dear Boma. How she loved him. “She pot her arms around hi* neck und put her cheek close to his. “•Boma. I will not cry an} more. Boma. I will not make you feel ao aad any more.' •This wn* .11 some little time ago." Daddy continued, ’lint there Is great happiness now In the cblmiiansee family. For there Is another little baby to take the place of the one Suzanne lost. “And Burette and Boma are proud and happy and glad and they smile und chatter as the vi- ’or* <-'-ue to see them. Ard 8-^ette l'*‘*ks down at the little bundle in her arms and sings to It soft cradle tongs of other lands. “'My little b»by I love you. “And Daddy Bom* love* you. loo! - “

Simplicity Itself. A fair visitor »*' much taken by the complexity of the battle wagon’s engines und delighted with her guide’* explanations thereof, although she seemed surprised that the engineer did not know which way the ship was headed us he stood his watch below at the throttle. “Well. miss. It’s this way.’ - he explained. Tm an independent cuss. 1 am. and no matter whldi way the captain Is steering the ship. I always keep my engines going straight ahead." — American Legion Weekly-