Amber Strings We .are showing some very attrac- tive necklets of GENUINE AMBER The price of this very at- tractive Ornamental Bead is steadily coming down. Some of these Strings suitable for Young Girls, are priced as low as ......$4.00 Others larger, "AND MORE THAN ER FOOT POWDER - 25 Cents . Anti-Perspiring | NW Frame, 6 rooms, foi- EUV let, central, deep lot. N Frame, 6 rooms, toi- . let, electric light and gas. : Frame, 6 rooms, S$. and in greater lengths, up to electric. light, gar- den. Frame, \7 rooms, electric ° light, gas and furnace, central. 7 rooms, frame, 3- piece bath, electric light. 's Real Estate . 113% BROCK ST., GSTO | SL. HINGE y The Civic Utilities reduced the price of gas for cooking a short time ago. We have a Gas Range to meet every pocket. (A) 3 Burner Low Oven Gas Range $22.00 3 Burner Low Oven Gas Range-- largeburners ...... ... ...$30.00 * 3 Burner Low Oven Gas Range-- © large burners, N. P. trim .. .. $33.00 " 4 Burner Low Oven Gas Range-- large burners, enamel top . .. $40.00 * 4 Burner Cabinet Range, N. P. top and whiteenamel ..... .... $85.00 McKelvey & Birch, Limited Plumbers' and Gas-Fitters' Supplies, Stoves, Shelf, Heavy ibe) the world-renowned mining districts Visit Jasper Natiood! Prk im the Heart of the Rockies FG 1 : 2. Grid Condenser and Leak Method Yesterday we showed how detec- tor action in a tube occurs when the tube is operated on the 'grid bias" method, making use of the lop-sided amplification which will obtain ow- ing to the "bend" in a tube's char- acteristic curve. We also mentioned that many hard tubes had cirves in which a "bend' was practically en- tirely absent, which did not fit them for detection by means of the "grid bias" method. To-day we will describe detection through the use of a grid condenser and leak, by far the more common method. The method can be used regardless of the shape of the curve, which is one of the reasons for its popularity. Detection by grid condenser and leak is a little more difficult to ex- plain than detection by grid bias. First of all, let us consider Fig. 1, which shaws how the grid current varies as the grid voltage is varied: The grid current is the very slight current which passes from the grid to the filament, Most grid-current curves have bends in them which make a sort of detector action in the grid circuit possible, so that an incoming signal, ds represented, will, if the grid is operated at a slight "positive" poten- tial, result' in an increase in grid current. Remember this! Now here we come to the difficult part, because you must keep in your mind's eye simultaneously what is happening both to the grid current, as just mentioned, and to the plate current, as shown in Fig. 2. In Fig. 2 we show the incoming signal, as indicated. But this in- coming signal does not behave the way the same signal would with a grid bias. With the grid bias, the signal would vary equally on each How A Tube Detector Works. PROBS :--Saturday, fresh winds, with showers and local thunderstorms. "- 3 nt FIG 2 Why doesn't it do the same thing here? The reason is really quite simple. Remember that as the signal comes in our grid cur- rent increases, as shown in Fig. 1. Well, this increase of grid current attracts "negative" electrons to the grid, which pile up and make the grid increasingly "negative" as the signal comes: along. So our incom- ing oscillations, instead of keeping to the line "A" gradually wander farther and farther to the "negative" gide with the increasingly negative grid, until when the wave-train has ended, we are at point "F"---consid- erably more "negative" than the starting point "S." While this has been Lappening the plate current has changed, because remember that changes in grid volt- age vary the plate current. So'our decrease in grid voltage has result- ed in the indicated variation of plate current, which resolves into an aver- age "decrease" shown by the dotted line. This decrease can produce sound in the telephone receivers just as well as the increase could in the case of the grid-bias method | shown yesterday, so we again have detector action. But we are not through yet. At the end of the wave-train, our grid | had accumulated a flock of negative | electrons, and had ended up at "F." leaving the plate current reduced to | "G." The grid condenser keeps these from leaking off, 50 we must do something to get rid of them be- fore the next yave-train comes along, so that the next wave-train will find everything in normal position and ready to function again. This is what the grid leak is for--it allows the negative charge on the grid to leak off and come back to normal at "A," thereby allowing the plate cur- rent to normal in readiness for the next wave train. side of line "A." | oo BROADCASTING | a} The following is a list of radio stations and their broadcasting pro- grammes which may be heard locally on Saturday: WGY (380) Schenectady, N.Y. 1130 a.m.--Stock market report. 11.40 a.m.--Produce market re- port. 11.55 a.m.--U. 8. Naval Observa- tory time signals. 9.30 p.m.--Dance music by Jo- seph A. Chickene and his Clover Club Orchestra. HR Club Orchestra, N.Y.; popular songs by Frank Davis. WJZ (455) New York City. 1 p.m.--Hotel Vanderbilt orches- tra direct. 4 pm.--Herman Riedrich, Jr. basso. 4.30 p.m.--Roger Wolfe's Bilt. more tea room orchestra. A 5.30 p.m.--State and Federal ag- ricultural reports; farm and home "| reports; closing quotations of the New York stock exchange; "Eve- ning Post" news; foreign exchange quotations. 7 p-m.--Waldorf-Astoria roof or- chestra. 8 p.m.--Ned Jacobs presents Alex- is Kudisch ensemble; Ruth Arden, soprano. 10 p.m.--Talk by the Museum of 'Natural History. 10.30 p.m.--Hotel Astor orchestra, danee ------ KDKA (920) Pittsburg, Pa. 9.45 a.m.--"Stockman" report on the Pittsburg livestock market; general market review and agricul- tural items, 12 noon--"Stockman' reports on the Pittsburg livestock ani whole- sale produce markets. . 2 p.m--Popular concert, with baseball scores, inning by ianing. 5 p.m.--Baseball scores. 5.30 p.m.--Dinner congert by the 'Westinghouse band. 6 p.m.~~Baseball scores; dinner concert. WBZ (387) Springfield, Mass, . 8 p.m.--Results of games played By 8 Eastern, American and Na- leagues. 6.05 pm.--Market reports as fur- nished by the United States depart- 33 p.m.--Bedtime story for the kid 6.40 p.m.--Concert by the Hotel Kimball Trio. Jan Geerts, violinist and director; Angela Goddard Loa- apa, 'cellist; Paul Lawrence, pla- Mrs. F. G. Dawson Dead. | f Prince Rupert, B.C., Aug. 8, --Mrs. Dawson, wife of F. G. Dawson, a di- rector of the Canadian National Rail- ways, died Wednesday evening. Mr. Dawson was called to his home from a banquet being held in honor of Sir Henry Thornton and party. As a result of the first day's play in the second round of the Davis lawn tennis cup matches in Mont- real, Japan has a lead of two games over Canada. A Vancouver scientist says the an- thropoid ape is not one of the links in man's genealogy. LONG COAT POPULAR = a ] SATURDAY | A Gala Bargain Day At Steacy's! Shop to-morrow at this big, cool shopping centre and reap the benefits of the many bargain attractions. From 9to 12 O'clock SHOP EARLY -- SAVE 109 Double Discount Stamps Summer Millinery $1.95 24 only, smart, Mid-Summer Hats to close out at this sensa- tional price. The season's most attractive shapes, shades and trimmings are in the group, developed in Straw, Mohair, Silk Crepe and La Visca Satin. Regular $5.50 to $15.50 values. Cash and carry only at this stupendous reduction. Women's Sweaters $2.48 24 only, charming, new, colored Voile Blouses, Striped Habutai Wash Silks and English Broadcloths. New styles are the feature of this special, while the values speak for them- selves. Regular $4.50 to $6.75 each. Ladies' Bathing Suits $2.98 ea. 36 fine Wool Jersey and Worsted Knit Bathing Suits, in a broad assortment of colors. The sizes range from 36 to 44, Regular stock values at $4.50 and $4.75. Corsets 69c pair 180 pairs Steacy's Special French Coutil Corsets in Flesh and White, with four garter supports. Regular $1.00 and $1.25 values. Linen Towelling 5 yds. for $1.00 800 yds. of extra heavy, pure Linen Towelling. Regular 25c. a yard quality. Golf Sweaters $3.98 ea. 19 only, Novelty Colored Sweaters in Pullover and Tux- edo styles. Regular $8.25 to $10.00 each. Children's Fall Coats $5.00 ea. 24 Reefers and Coats made of all wool fabrics. 6 to 12 years. Regular $7.50 to $14.50. . ee 'Ki t 's Sho - n C f *"" Sizes