. Principles of radio transmission and reception with antenna and coil aerials . 12 Fig. 17.—Directions of flow of dielectrx currents in laboratory type of condenser It is rather difficult to determine what fraction of the effect ofa coil aerial is due to antenna action and what part to coil many cases, doubtless, the antenna action predominates. Itis possible, however, to separate the effects in any particular caseby the several different methods. The antenna effect may becalculated, at least for parts of the circuit, by the aid of carefulammeter readings, which show what amount of
. Principles of radio transmission and reception with antenna and coil aerials . 12 Fig. 17.—Directions of flow of dielectrx currents in laboratory type of condenser It is rather difficult to determine what fraction of the effect ofa coil aerial is due to antenna action and what part to coil many cases, doubtless, the antenna action predominates. Itis possible, however, to separate the effects in any particular caseby the several different methods. The antenna effect may becalculated, at least for parts of the circuit, by the aid of carefulammeter readings, which show what amount of the current hasflowed off into the dielectric. The antenna effect may be elimi- Deumger) Principles of Radio Aerials 487 nated, thus leaving only the coil effect, by a carefully-arrangedsystem of shields and grounds; or, by a symmetrical arrangementof the coil structure which causes the antenna effect in each partto be balanced by the antenna effect in some other part. Thecoil effect may be eliminated, on the other hand, in the case ofa receiving coil, by taking advantage o
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