. 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 . current is produced in the secondary wind-ing. The primary current may be only six volts, butthe secondary winding produces perhaps 5 to 10,000 stepping up of the voltage is a necessary part ofradio transmitting. Transformers are larger devices in-tended for stepping up the v
. 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 . current is produced in the secondary wind-ing. The primary current may be only six volts, butthe secondary winding produces perhaps 5 to 10,000 stepping up of the voltage is a necessary part ofradio transmitting. Transformers are larger devices in-tended for stepping up the voltage of heavy currents. At any rate, high volta?e current is produced in thesecondary winding. The interrupter causes the secondary 16 RADIO FOR EVERYBODY to flow first in one direction, and then in the other, asthe primary current is interrupted. The secondary cur-rent, flowing- for a moment in one direction, charges thecondenser, consisting of aerial and ground. However,the capacity of the condenser is limited, and when it ischarged to overflowing, it releases its energy which jumpsthe spark gap in the form of a fat spark, only to pileup on the other side of the condenser. Again the con-denser is filled to overflowing, and it discharges oncemore, this time causing the current to flow in a direction. Ground The essentials of transmitting radio signals, comprising a spark coil, aerial, ground, spark gap, key, and battery, as well as an inductance coil for tuning purposes. opposite to that of the first time, and again the condenseris charged. Thus the discharges take place back andforth, but far faster than it takes to explain their actionhere. Indeed, the discharges travel back and forth withthe speed of light, but gradually diminish in strength until RADIO FOR EVERYBODY 17 the charge is exhausted. Every time the vibrator in theprimary circuit makes or breaks the current in the prim-ary, one of these trains of alternating- current or oscilla-tory current is started. Since the
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
