. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 125—Square Coil Type Oscillation Transformer. COPPER STRIP as in Fig. 127. The inductance ofthe latter type is altered by meansof a plug contact. It is, of course,essential that adjacent turns be wellinsulated from one another andseparated so that there will be nosparking between them. Also thecoil must be mounted on an insu-lated base or on specially devisedinsulators to prevent the high volt-age current leaking to nearby con-ductors, or conducting material. 105. The Short Wave Con-denser.—One for
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 125—Square Coil Type Oscillation Transformer. COPPER STRIP as in Fig. 127. The inductance ofthe latter type is altered by meansof a plug contact. It is, of course,essential that adjacent turns be wellinsulated from one another andseparated so that there will be nosparking between them. Also thecoil must be mounted on an insu-lated base or on specially devisedinsulators to prevent the high volt-age current leaking to nearby con-ductors, or conducting material. 105. The Short Wave Con-denser.—One form of this con-denser as constructed by the Mar-coni Company, has four glass platesIS by 15 inches covered with tinfoil 12 by 12 inches. Each plate has a pig. 126—continuously variable Aerial Tuning no PRACTICAL WIRELESS TELEGRAPHY. capacity of approximately .002 mfds. and since four are connected in series, theresulting value is .0005 mfds. A very recent type of short wave condenser manufactured by the Marconi Company is shown in Fig. 128. Four copper platedglass jars are mounted on a metal rackand connected together as follows: Con-nection is made from the binding post Eof the left hand inside jar A to the aerialsystem. The outer coating of jar A restson the inside coating of the jar B. Theoutside coating of jar B makes contactwith the outside coating of the jar Dthrough the metal rack. The circuit con-tinues on from that point in just the re-verse direction, to that cited in the firstcase, finally ending at the binding post ofjar C. The four jars are thus connectedin series and have combined capacity of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
