Gives 575 terms in French, English, Russian, German, Spanish, Italian, Dutch, Polish, Swedish with their definitions in French, English and Russian subdivided into following sections: basic terms (general tube classification, emission and space charge, discharge in a gas, beam focusing and deflection, tube noise, current, voltage and power, general properties and quantities other than current, characteristics and conditions of operation, 165), construction (electrode (general), elements and emitting electrodes, controlling and collecting electrodes, structure (envelope, gun and accessories), 87), types of tubes (space-charge-controlled tubes and diodes, space-charge-wave tubes and space-charge-controlled microwave tubes, cathode-ray tubes and storage tubes, photosensitive tubes, gas-filled tubes, 115), properties and quantities (208). Terms are ordered by topics, indices in the above*languages give the terms in alphabetic order.