. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . nt, and hencesuch a circuit radiates very feebly. On account of these differences anopen circuit oscillator (fig. 30) is often called a radiating circuit, while MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. 61 a closed circuit (fig. 26a) is called non-radiating, although all highfrequency circuits radiate in some degree. 97. Let fig. 32 represent a closed circuit inductively connected to avertical, grounded, open circuit or aerial, and suppose the spark gap tobreak down at the point of maximum potential of the
. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . nt, and hencesuch a circuit radiates very feebly. On account of these differences anopen circuit oscillator (fig. 30) is often called a radiating circuit, while MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. 61 a closed circuit (fig. 26a) is called non-radiating, although all highfrequency circuits radiate in some degree. 97. Let fig. 32 represent a closed circuit inductively connected to avertical, grounded, open circuit or aerial, and suppose the spark gap tobreak down at the point of maximum potential of the charging this instant there is no current in the closed circuit and, therefore,no current in the open circuit. The energy is all electro-static, all in theclosed circuit and practically all in the electro-static field between thecondenser plates, the capacity of the spark points and other parts of thecircuit being very small. As soon as discharge through the spark gap commences, the field of thecurrent in the closed circuit inductance induces movements of electric + u- J1. Fig. 32. Fig. 32a. charges in the open circuit, the starting point of the disturbance beingthe open circuit inductance. As the charges in the open circuit separate,they are connected by electro-static lines of force and surrounded bymagnetic lines of force, both moving outward at the same rate that thecharges move in a straight wire. The electro-static field becomes a maximum when the charge reachesthe top of the wire. At this time the magnetic field is a minimum. Atthe expiration of a half period, when the charges meet again, the mag-netic field is a maximum, but reversed in direction. The electro-staticfield reverses as the charges separate again. If they can be representedas meeting in the open circuit inductance, the electro-static field just afterthe end of a half period can be represented as in fig. 32a, where themutual repulsion of the electro-static lines of force outside the wire haskept
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