Bemidji Daily Pioneer Newspaper, June 26, 1922, Page 12

FRRRIRERSEON In. the Spider World the Male of the Species Must Be a Master of: “Jaza." There is a certain little splder, we are told by G. G. Clark in his “Tiny ‘Tollérs ‘and’ Thelr Work,” who has to exhibit his proficiency’ as a master of Jazz- in order- to charm the- creature with-whom he would mate. If he is a bad: dancer he goes unmated. He Is called “the zebra™ spider because of white stripes that run along-his black abdomen. In setting. forth upon a matrimonial quest: the zebra. spider does not anoint himself with.the special perfume which some insects use in like circumstances, non does he, as the cricket is supposed to do, rely-upon his abdity as a maker of muslc;: he simply appears before the object of his desire and beglns to dance—first a jazz and then a waltz, alternating them, it would seem, with the idea that one or the other must captivate Miss Spider, who sits and watches him. critically with all her eight eyes. She frequently, it is sald, is hard to please, and a male zebra has been known, to repeat. his jazz and waltz as many as 111 times for the entertain- ment of an obdurate insect with which 1t would mate. However, few “court- ships” are as.long as this, the wooed one_usually. making up her mind after a few minutes of his dancing. If her 1 GE HIS MATE Jocision be fayorable, she. soon; Jp[ns the supplicant In n mad whirling swaltz. 1f, on .the other. hapd, she fs not charmed, she either turns away. in con-. tenipt, or savagely rushes upon him, with, intent to murder. — Is She? A young Southerner, very pretty and charming, Is teaching in ‘Hibbing, Minn, She had carefully explained ito her youngsters the use of the inter- ‘rogation point. “For tomorrow,” she told them, “I"want eaeh of you to bring in a question. Don’t bring some- thing ordinary, but find something in- teresting.” Tomorrow and its questions came, Some of them were good and- others were impossible. One small fellow, a youngster with rosy cheeks and sparkly eyes, waved his hand wildly: The teacher called on him. He stood erect, to the very height of his tiny stature, and read: “Is any girl safe?” Look Before You Leap. A novice was braving the Dart- mouth ski-jump. He shot down: the incline, lurched. weakly at the take- off, landed face downward below. and finished the slide, nose first, plowing into the snow smother. "You jumped too late, Joe!" yelled an enthusiast. “Naw”—from the smother helow—*1 ;jumped too soon. Should have learned. more about tha game first."—Every bod Magazine, The. proper- stor: of Furs will and moth damage. Bemidji PROTECT YOUR FURS best appearance when again desired for use. We thoroughly clean each garments and insure it against fire, theft WE ALSO DO MANUFACTURING, CLEANING AND REPAIRING, KRUSE & GROSS MANUFACTURING FURRIERS prolong their life. and insure. their. Over Security Bank ! B. W. LAKIN, President C. L. ISTED, Secretary-Treavursr ~ BEMIDJI LUMBER & FUEL GO, OPPOSITE GREAT NORTHERN DEPOT LET US SUPPLY YOU WITH LUMBER - LATH - LIME - CEMENT - PLASTER PAPER—ROoofing and Sheathing BRICK—Common, Fire and Fancy Sash Doors and Mill Work. FULL LINE OF DRAIN TILE AND SEWER PIPE E. Ri EVANS, Manager SHINGLES POSITION AND SIZE OF GRID INPORTANT Determine; Vahle of Negative Po- tential Necessary to Reduce the Plate Current to Zero. In using a three-electrode vacuum tube in a radio set it is preferable to maintain the grid negatlve with re- spect to the filament In order to re- quire the minimum amount of energy. in the control of the plate circuit. The relative position of the grid with respect to the filament and the plate and the size of the mesh of the Flata Cyrrerrs —» 7Baitiva -~ iplate and a negative pofential of E-O 11s applied to, the. grid, it will reduce ;the current to zero. i Suppose O-B: represents five volts. {1t can, be seen then that a change of ifive volts in grid potential' will accom- iplish the same result that 40, volts will :in the plate ®ircuit. The ratlo. of ithe voltage change in the plate cur- irent is called the factor of the tube and is denoted by the letter “K,” In the tube just discussed the am- ‘plification factor. would be 40 divided !by. five or eight. The amplification [factor- of the tubes avallable for ama: {teur use at present is usually between 4 and 10. The amplification factor 1s :a function of the dimensions and rela- itive. positions of the elements in the itube. An incoming radio ifrequency- al- ternating current applied to the grid of a three-electrode vacuum tube is ‘not only rectified but the varlation in the plate is multiplied by “K,” the ‘amplification factor of the tube. This Griof Potential grid, determine the value of E. ‘E is the negative potential which must be applied to the grid in order to reduce the plate current to zero. The value of F, which is the positive grid poten- tial that will: cause the maximum or || saturation current to flow in the plate. cireuit, is also determined by the rela- | tive position of the grid with respect to the filament and plate. If the grid | is of very fine mesh, the value of E is small because the electrons in pass- ing through the small mesh of the grid on their journey from the fila- ment to the plate will negatively charge the grid and will be repelled. Similarly a small positive charge ap- | plied to’a fine mesh will tend to ac- celerate the velocity of the electrons. In case of a very coarse mesh grid, | the electrons can pass. through the ap- ertures In the grid without coming in 80 close to the charge on it and a relatively high potential will be re- quired on the grid to control the elec- tron stream, or in ofher words, the current flowing in the plate circuit. Referring to Fig. VI, O-G, is the current that will flow in the plate cir- cult when there is no potential ap- plied_to the grid. Suppose a positive potential as O-I is applied to the grid. ;makes the threg-electrode vacunm the. most sensitive detector available. In actual tubes thfe point “G” on the characteristic' curves as shown in Fig. VIII and Fig. IX may not fall on such, a point of the curve that symmetrical {changes in grid. potentigl will cauge a symmefrical change in plate current, starting with zero potential on. the grid. It then becomes necessary to. apply a constant potential to the grid by ‘means of a battery in the grid cir- cuit, called the “C” battery, to main- tain the grid at such a point on the characteristic curve that symmetrical changes In grid potential will cause the maximum symmetrical current to flow in the plate circuit. Big: Ships’ Radia. The radlo equipment of the ships Parls and Lafayette Is described in, a recent issue of Radloe]ectricity. On both steamers a fivekilowatt tube trans- mitter has been Installed with a wave. range of between 2,000, and: 9,000: me- ters, A five-kilowatt motor-generator set is used to, produce the plate-high tension for four rectifying and four Again under the management of PAUL 0. SWEDMARK Special Dinners Served BEST OF FOOD AND SERVICE AT ALL HOURS FORMER PATRONS ESPECIALLY /4 URGED TO TRY US AGAIN. } . f. —OPEN DAY AND NIGHT— £l .. +—: PALACECAFE :—: i F 4 © 112 Third Street i : T I [ F. M. Pendergast Implement Co. Residence Phone 17-F-4 . Office Phone 232 SCHROEDER BUILDING Manufacturers’ Agents and Dealer in FARM MACHINERY OF ALL KINDS “Hudson” Barn Equipment— “Stoughton” Wagons, Spreaders and Mo- tor Trucks— ::Champion” Potato Machinery— Emerson-Brontinghan™ line of Plows, Standard Mowers and Rakes— “E‘-_B.” ractors— “Geisser” Threshing Machines— Hydro Toron Auto Tires and Tubes ' Gasoline and Oils Brooks Bros. Double-Wall Silos. Nearest to being Frost-Proof of any Silo made. . 204 Fourth St. & Minnesota Ave. BEMIDJI, MINN. The corresponding plate circuit current will be I-D or B-D, more than it was when the grid had no potentlal ap- plled to it/ A negative potential of- O-H s now applied to the grid where O-H is squal in value to O-I, but opposite in sign. The application of the negative. po- tential when applied: to the grid will cause the plate current to. be. reduced to a value H-C or A-C, less than it was when there was no potential ap- plied. to the grid. So.it is séen that a negative potential when applied to the grid does not reduce the plate. circuit current as much-as the same positive potential increased. the plate circuit current. This irregular conductivity of the tube Is made use of when the tube is used as a detector or rectifier of radio signals. The incoming radio signal is a high frequency alternating current. Let us apply an alternating difference of po- tentlal whose waximum positive val- ue Is equal to O-1 and'whose maximum negative value is equal to O-H, to the grid of the. three-electrode tube whose characteristic curve Is the same a6 -that shown. in Fig. VIII. In Fig. 3| IX is shown the alternating difference of potentinl applied to the grid. Through the first quarter of a cycle, ifrom: zero at J to a maximum- nega- | tive. value at K, equal to O-H, the 'plate. circuit current will: vary from 0-G, its value at P when no grid po- tential Is applied to a'value at Q equal to H:Gy During the next quarter of a cycle the grid potential changes from a maximum negative value at K to zero at L. The corresponding values of plate circuit current are shown by the portion of the plate current curve QR. . During the next or third quarter of a cycle the applied grid potential increases from zero at L to a maxi- mum positive value at M; equal to O-I, and causes the plate.circuit to in- crease from I-B, its valne when the plate potential iy, %ero, to-I-D; an In- crease in plate current equal to B-D, ter of a cycle as the applied grid po- tential varies from a maximum posi- circuit current varies from a value S to T. Assuming that the characteristic curve as shown in Fig. VIIT and Fig. IX was with a potential of 40 volts on, the plate, then, if the plate current | is. to. be reduced to zero by a varia- tial applied. to the grid—the plate voltage must be reduced to zero or'a During the remaining fourth quar-: tive value at M to zero at N, the plate||] i tion of plate voltage—with no poten- [ i i ? reduction of 40 volts must be made. | -oscillatory tubes, and the low. voltage current. for. the heating. of: the filament 'of. these tubes. Both vessels are equipped, with a radio Fange-finder, or. ‘“radlo, goniometer,” which, reduced ta plain. Engligh, means a radio compass. A distance. of 3,400. kilometers has been covered: safely by messages sent from the transmitter of the Paris. Radio for Animal Training. Experiments with the radicphone as ‘ap ald in animal training are to be :made at the Hippodrome, New York city, by George Power, trainer. of the elephants, to determine whether it will .be possible for his big pets at some future date to execute lis orders on ithe stage while the trainer himself is absent. . Professor. Bell a Radio Fan. Finding the. telephone, his own in- .vention, a source of annoyance to him, ‘Alexander Graham Bell' had it re- ‘moved ffrom his home. With the ra- diophone there is. a difference, it iseems, for Mr. Bell, now seventy-five years old, is sald never to’tire of “lis- tening in” and experimehting with the ‘new device. There are few more ar- ident enthuslasts, declare his friends. RAD}O DON'TS —_— Don't-expect the clrcuit to os- cillate with equal strength over a. great range if- yon tune the grid clreuit. with. capacity alone. Keap the. ratio of’' L to C: as near constant as. possible while tuning: Don’t expect a. circuit to os- cillate: if the natural period of the tickler circult is: egual to the natural period of the grid circuit Don’t place the tickler or plate variometer tight against the grid coil or & change:in the plate circuit will detune the grid. circuit. Don’t expect high. impedance : tubes: to.qscillate freely. i a ¢ir- cuit; designed: for low. impedans R . & . i I i BEREEEY, T 3 b MONDAY EVENING, JUNE 26, 1922 SLOGAN WELL WORTH WHILE Campaign for. the Owpership of Homes a Movement All Good Citizens Should: Boost. It is to be hoped that the campai; the object of which is to have every family in its own home may not lan- guish soon, as it is.all too tikely to do. Tenantry in large cities cannot be abolished altogether; perhaps it would be undesirable to do so. However, tens of thousands of people would be better off physically, mentally and morally did they. live under their own vine and fig tree. Vastly too many people are still unnecessarily dependent upon the wish and will of others, industrially, politically, socially; a condition ténd- Ing ever toward slavery, injustice and unhappiness. Ownership of anything spells independence in some measure, though it often means restraint, too; and to own oge’s. home, where none most satisfying of all. The owner of a home Is logically a better citizen, a more public:spirited person, than he would be otherwise. The. condition of a neighborhood, the quality of government; sanitary and social matters, are at their best where most people own their homes. What dpes the average renter care for the of passage, he: seldom identifies him- self with. the progress.or. welfare. of. . the community, as does an, owner, and. at the merest whim he is'on the wing. To own one’s home is not generally an easy accomplishiment, but requires resolution, self-restraint and- tenacity. Few slogans are more worth while.— £hicago Journal, . CITY PLANNING. PAYS WELL Haphazard Method. of Allowing Com- munity to Develop Is Poor Policy and Cgstly in the End: The civic leagues and societies that. get after the. authorities to compel the. cleaning up of cities and: offer prizes and other inducements for well-kept lawns, attractive flower: beds, re- formed back yards and the like. are advancing culture and civilization. Many cities have followed Washing- ton’s example and have art commis- slons that pass upon. all public work to keep it in harmony with some es- tablished plan of artistic development, We should go further than that. Our building departments carefully ex- amine every plan made for private as well as for public bulldings and pre- scribe just how the walls shall be for strength, how high~the building may go, what the sanitary details must be. The people have become used to such control and direction. The city art commission should have greater power and should co-operate with the build- ing department and pass on all plans for all buildings, private as well as public—Washington Star. Roadside Tree Always Worth While. The example set by the statr of Micnesota, which will plant some 30,- 000_trees along its Righways this year and each succeeding year will add sev- eral thousands more, conveys a lesson not only in reforestation in a relative- ly treeless state bus in the esthetic value of arboriculture as well. Un- Joubtedly the years to come will bring their reward and travelef3 of the fu- ture, If-they give the matter a thought at all, will pay tribute to tlie fore- sight which furnished them with grate- liarly restful kind to the landscape, A ribbon of road stretching across a treeless plgin Is but a bleak thing, whereas it becomes an “avenue” when graceful trees nod in the breezes on both sides of it and travelers passing through into. other states which have neglected their opportunities will not side tree on the Pacific coast is a mat- ter worthy of the attention of both the planter and thé conservationist. —Portland Oregonian. Select Location for Plants. The south side of a structure if ful- 1y exposed to the sun and not shaded ih any way is lkely to prove particu- larly trying for many plants, especial- 1y those which require a cool location. Their foliage is likely to bgcome scorched and burned during hot, bright days in summer, and if tle plants themselves are not killed, they. com- monly fail {o grow well and are un- satisfactory. When such trying con- ditions have to be met, plants which can withstand considerable heat and dryness should be selected. On the other hand, care shoild be taken that plants which can withstand cold and Jack of direct sunlight should be plant- ed upon the north side of the struc- tures. —_— 0il and Air-Cooled Motors. tubes; . M As the result of tests made during Don't, discard; 2 regenerative & the war at the aircraft factory at receiver: until, you, have tried % Farnborough, Eng., it was demonstrat- mare: than, ane, detector tube. Li ed that in air-cooled internal combus- Don't forget that a soft gas- t tion engines as much at 40 to 47 per cous tube-1s the best deteetor, 3| cent of the cooling was, under cer- % and that: a hard; tube stthe best' 1| tain conditions, done by the crank- ¥ oscillator. ®) cqse. The result has been the design ‘§ Den't, treat: inductance colis =; of a so-called oil-cooled engine, in ' with: shelldo or. any othen var-* §i.which the crankcase has. been greatly s nish; or compannd that will ab- ‘8| enlarged so as to ahmost completely & sorb.moistuge.. $envelop the cylinders.—Popular Me- chanics Magazine. SUBSCRIBE FOR THE PIONEER dare intrude or make. afraid, is the | condition of his neighborhood! A bird | DOLLAR . %/ DAY 55~ JUNE 28th \ WEOFFER | ~ ONEDOLLAR '~ ~~1. 1 REFUND ON EVERY “ $5.00 PURCHASE FOR THIS ONE DAY! HUFFMAN & | O’LEARY | ! Home Furnishers ful shade and added beauty of a pecu- [ fall to note the difference. The road- | Bemidji's Free Playground .Diamond Point Invites You Evesy Day Camping Grounds Picnic Grounds Bathing Pavilion ~—Electric Lighted— SOFT DRINKS - LUNCHES - . Sold at the Park.- Plan Your Picnic for DIAMOND POINT Bathing Suits for Rent COFFEE ARCHIE DITTY Custodian We Are Independent of any scarcity of drugs. . Longiago we foresaw the situation. and. secured. a sufficient supply to enable us to fill ary prescription for a long time to come. So. bring . your prescrip- tions Here to be filled. We are in a, position to live up . to our old. rigid: standard of “no substitution.” Clty Drug Store There Will Be No Need to Ask You |' : to. -® H “Look Pleasant Please” |: When You Get Qur Prices on Fine | . PHOTOS and POSTCARDS. H REMEMBER!—You take no Photos or Post Cards from i RICH STUDIO : UNLESS THEY PLEASE YOU! i Kodak Films Developed | ag 6 Exposures, any size 10c 5 Prints, 3c, 4c, 5c —Phone 570-W— 29 Tenth St., Cor. Doud Ave. e