. The principles underlying radio communication . ubstance of high dielectric strength if the volt-age is high. For low-voltage service, where large capacity isessential, the condenser plates are made of tin foil with thinsheets of mica or paraffined paper between them. The sheetsare piled up as shown in Fig. 48, page 89. The dielectric layersare represented by aa, and the two sets of conducting plates by&b and cc, respectively. These are pressed into a compact CONDENSERS. 95 form and held in place by a clamp and the composite stack issaturated and sealed with melted paraffin or wax. If the co
. The principles underlying radio communication . ubstance of high dielectric strength if the volt-age is high. For low-voltage service, where large capacity isessential, the condenser plates are made of tin foil with thinsheets of mica or paraffined paper between them. The sheetsare piled up as shown in Fig. 48, page 89. The dielectric layersare represented by aa, and the two sets of conducting plates by&b and cc, respectively. These are pressed into a compact CONDENSERS. 95 form and held in place by a clamp and the composite stack issaturated and sealed with melted paraffin or wax. If the con-denser must withstand a very high voltage, the plates will bemore widely separated, and usually air or oil is used as thedielectric. If it is desired to have the capacity of the condenservariable instead of fixed, the construction usually takes theform shown in Fig. 49, page 95. Two sets of interleaved platesare insulated from each other, and one set is mounted so thatit can be rotated with respect to the other. Such a condenser Fl< PlaTe £on<der\ser of Varidbfd, E.|ecTric ^TrAin or Displacement
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