Identifier: abcofvacuumtubes00lewi (find matches)
Title: 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
Year: 1922 (1920s)
Authors: Lewis, Elmer Hugh, 1889-
Subjects: Vacuum-tubes Radio Radio
Publisher: New York, Norman W. Henley Pub. Co.
Contributing Library: Boston College Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Glass Wall of Tube ■-Filament Support\ (Springy) Plate (cut away) Grid Support -WiresSealed here<■ Leading-inWires -Brass Shell Base <—-ProngsFig. 12—Construction of a typical vacuum tube. of the V and W shaped filaments are upwards. No matterwhat the filament shape, it is supported in such a manner asto prevent its displacement when jarred. The tube of Fig. 12has a straight tungsten filament supported at its upper endby a nickle rod, to which it is carefully welded. The lowerend of the filament wire is welded to a shorter nickle rodand both rods are anchored into a glass stem. The longerrod is springy, so that it will hold the filament taught. 40 VACUUM TUBE RECTIFIER The grid may be a mesh of nickle wire wound about twosupports. In the figure it is shown as a spiral or helix, sosupported by a nickle rod that the filament becomes the axisof the spiral. Each turn of the spiral grid is welded to anickle supporting rod, the lower end of which is anchored into
Text Appearing After Image:
Fig. 13—Various forms of vacuum tubes and sockets. the glass stem. The grid must, in any case, be rigid enoughto withstand considerable jarring. The plate may be of molybdenum, nickle or thin sheet steel.It is quite often cylindrical in shape, but may also be flat orshaped like a cylinder flattened out on two sides. The plate VACUUM TUBE AS RECTIFIER AND RELAY 41

Note About Images