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<p>The effective capacity of an inductance coil depends in general both on the capacities existing between parts of the coil itself and on the capacities existing between parts of the coil and the ground. On account of the importance of capacity effects in h.f. inductance coils, careful studies of these effects, both theoretical and experimental, have been made. An interesting result which has been found is that one effect seems to depend primarily on the capacity of the coil to earth. This effect is observed when two condensers in series are connected across the terminals of the inductance coil and the common terminal of the two condensers is earthed. If the inductance coil possesses capacity to earth, the familiar criterion for resonance in the sy
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