. The A B C of vacuum tubes in radio reception; an elementary and practical book on the theory and operation of vacuum tubes as detectors and amplifiers. Explains non-mathematically the fundamental principles upon which all vacuum tube circuits are based. Includes practical circuits and practical questions and answers. It is written especially for the beginner. All electrical and radio terms are fully explained . y turn the variation mightnot be smooth enough. That is, it might be necessary tosecure a variation of inductance less than that of one turnon the coil. In this case a variometer may
. The A B C of vacuum tubes in radio reception; an elementary and practical book on the theory and operation of vacuum tubes as detectors and amplifiers. Explains non-mathematically the fundamental principles upon which all vacuum tube circuits are based. Includes practical circuits and practical questions and answers. It is written especially for the beginner. All electrical and radio terms are fully explained . y turn the variation mightnot be smooth enough. That is, it might be necessary tosecure a variation of inductance less than that of one turnon the coil. In this case a variometer may be used whoseconstruction may be quite similar to that shown in Fig. coil which may be turned is called the rotor and thestationary coil is called the stator. The inductance of avariometer may be varied by varying the coupling betweenthe rotor and the stator which are connected together. Inter-Electrode Tube Capacitance The filament, grid and plate of a vacuum tube all have somesurface area and, in operation, have electric charges placed 92 A B C OF VACUUM TUBES upon them. It is not hard to imagine them as being plates ofsmall condensers with the vacuum space between them actingas a dielectric. There is thus capacitance between the tubeelectrodes which may have certain effects upon the circuitsof the grid and plate. There is a condenser effect between .-/Terminals Rotor Windings^ StatorWindings A--. Knob ^Wire Connecting Stator to RotorFig- 35—Construction of a typical variometer. the grid and the plate and another between the grid and thefilament. In some cases the condenser effect may be con-sidered, as shown in Fig. 36, where a certain amount of capaci-tance is common to both the grid and plate circuits. Thecircuits are then considered as being coupled together bycapacitive coupling. Wave Length, Frequency and Resonance It will be recalled that as the frequency of ether oscillationsdecreases, the wave length of the oscillations increases andvice versa. When a circui
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