Popular science monthly . oberwill be needed for a complete sending andreceiving station. In fact, a complete setof parts is necessary for each terminal ofthe proposed wireless line. The followingmust, therefore, be at each plant: Station: 1 Antenna and support See September andOctober Loading Coil October article. I Ground Connection September I ChanRC-Over Switch wire for connections. Sender: I Set of dry or storage-cells See October Sending Key I Induction Coil I Spark-Gap Receiver: I Crystal-Detector See above. I Stopping-Condenser 1 Pair of Telephones
Popular science monthly . oberwill be needed for a complete sending andreceiving station. In fact, a complete setof parts is necessary for each terminal ofthe proposed wireless line. The followingmust, therefore, be at each plant: Station: 1 Antenna and support See September andOctober Loading Coil October article. I Ground Connection September I ChanRC-Over Switch wire for connections. Sender: I Set of dry or storage-cells See October Sending Key I Induction Coil I Spark-Gap Receiver: I Crystal-Detector See above. I Stopping-Condenser 1 Pair of Telephones I Test-Buzzer September article. I Strap-Key I Dry Cell I Uetector-Protecting Switch above. The above-named elements of the com-plete station must be carefully connectedtogether as shown in Fig. 2. It is a goodplan to use No. i6 or No. i8 lamp-cord forthe wiring of a set such as this. Thetwisted pair should be separated and smoothed out, and the single conductorsused independently. It is necessary to keep the transmitting. TLrTf-Js^^t 5;..GROUND FIG 2 SENDING KEY The wiring diagram of a complete stationshowing the location of wireless apparatus apparatus well away from the receivinginstruments. The loading coil, for example,should not be nearer than two feet to thedetector, telephones and stopping-conden-ser. As explained in the second article ofthis series, the lead-wire from the loadingcoil out to the aerial must be well insulatedif good work is to be done. It is veryimportant that the change-over switch bewell insulated, also, for three of its contactsarc subjected to the full sparking potentialof the transmitter (see the diagram ofFig. 2). The best plan for beginning work is tohave the two antennas, one at each station,as nearly alike as possible. If their formand height cannot be made identical, theyshotild at any rate have exactly the samelength of circuit. That is to say, thereshould be the same number of feet measuredfrom the ground connection tij) throughthe spark-gap
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
