. An elementary book on electricity and magnetism and their applications. Fig. 414. — A receiving tate about an axis so thatby turning the knob on topany desired amount of themovable plates can be in-cluded between the fixedplates. Finally, the receiving telephones used in wireless tele-graphy must be doubles-head telephones (Fig. 416) with a Mo table ][.. 11. — Variable receiving condenser. ELECTROMAGNETIC WAVES 561

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19