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References in Radio Text Books Relating to the Tube 80 1
the sense that the current in one circuit can be shut off by the impulses in another and totally different circuit. For instance, in Fig. n, in which A is a magnetic relay circuit and B is a vacuum tube circuit, the closing of key K, in either system, will break the circuit through the telephone receivers. In A, the lever will be pulled down, opening the circuit at S, and in B, the high negative charge supplied to the grid will open the circuit at S.
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THE RADIO LIBRARY
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fundamental action of the vacuum tube is explained in almost every modern radio book. The student reader will find the following bibliography of interest and assistance:
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The Outline of Radio, by John V. L. Hogan, Chapter eight. An easily understood exposition of detection.
The I. C. S. Radio Handbook, pages 216 to 237. This is less elementary but should be easily followed by the reader who comprehends most of what he has so far read in "The Radio Beginner."
Vacuum Tubes in Wireless Communication, by Elmer E. Bucher. Parts One and Two. Less elementary.
Principles of Radio Communication, by J. H. Morecroft. Pages 364 to page 467. This particular book is recommended to the engineering student. While starting with the simple elements of the vacuum tube, it rapidly develops into a mathematical exposition of the subject.
Vacuum Tubes, by H. J. Van der Bijl. A similarly exact but perhaps more thorough research than the excellent chapters by Professor Morecroft.
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THE RADIO LEXICON
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IONIZATION: A phenomenon caused by the passage of current through gases — generally rarified. Mechanically, it is the result of repeated collisions between the infinitely small particles of which we believe matter to be composed. It is usually evidenced by a visible glow or haze.
FILAMENT: The wire in a vacuum tube which is heated, generally to incandescence, and which in this condition throws off electrons. PLATE: The metal "anode" or element in a vacuum tube upon which a positive charge is placed to attract the electrons from the filament. TUNGAR BULB, RECTIFYING TUBE, FLEMING VALVE: Trade and technical names for a twoelement, plate and filament, vacuum tube. GRID: The third "element" introduced between the filament and plate by Mr. Lee De Forest. It controls the flow of electrons from filament to plate by means of the electrical charge placed upon it.
PLATE CURRENT: The current through a vacuum tube which flows from filament to plate. SPACE CURRENT: Generally the same as plate current, but occasionally used in reference to a current between grid and filament or plate. A BATTERY: The cell or battery supplying the filament lighting potential to a vacuum tube. B BATTERY: The battery applying the high positive potential to the plate of a vacuum tube. (Usually of from 22.5 to 135 volts). RHEOSTAT: A variable resistance of comparatively low maximum ohmage. In radio, it is generally used to regulate the voltage applied to the filament.