. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . pacity. One condenser is placed acrossthe primary winding—or in series with it if the wavelength of the antenna-ground circuit is to be reduced—while the other is placed across the secondary winding. RADIO FOR EVERYBODY 301 A fixed condenser must be constructed. This consistsof nothing
. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . pacity. One condenser is placed acrossthe primary winding—or in series with it if the wavelength of the antenna-ground circuit is to be reduced—while the other is placed across the secondary winding. RADIO FOR EVERYBODY 301 A fixed condenser must be constructed. This consistsof nothing more formidable than a number of sheets oftin foil separated by pieces of paraffined paper. A goodcondenser may be made by cutting ten pieces of tin foilso that they will measure one inch wide by three incheslong and cutting eleven pieces of paraffined paper so thatthey measure one and one-quarter inches wide by twoand one-half inches long. The paraffined paper and thetin foil sheets are assembled in staggered order as shownin the accompanying sketch. The pile of tin-foil andparaffined paper can be placed between two pieces ofcardboard and held together by means of a rubber bandor piece of thread wrapped around the cardboard endpieces. The grid leak had best be purchased, for it is a rather 40 TURNS. FIBRE SHELL Completed variometer, showing the movable coil partly fixed and the movable windings are connected in series,so that the current must pass through both of them, oneafter the other. 302 RADIO FOR EVERYBODY difficult thing to make even though it does not consist ofmore than a pencil line drawn on a piece of good paperand clamped between two copper washers. If the con-structor wishes to build the grid leak as well as otherparts of the set, he is welcomed to try it, although itwould seem that since this item costs but 50 cents to buyit ready made—and properly made—it is best not towaste time and effort in trying to construct a grid leak. Then we come to t
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
