. Practical wireless telegraphy; a complete text book for students of radio communication . COPPER 5TWP, VARIABLECONTACT. Fig. 121—Showing Position iMaximum Coupling of TypeA Oscillation Trans-former. Fig. 122—Pancake Type Oscillation Transformer. turns of the secondary and therefore no induc-tion takes place in the secondary but in the posi-tion, Fig. 121, the lines of force cut the secondaryturns at a right angle and the coupling is maxi-mum. In all transmitting sets it is advantage-ous to have the inductance of the primaryor the secondary winding continuously va-riable, i. e., the construct
. Practical wireless telegraphy; a complete text book for students of radio communication . COPPER 5TWP, VARIABLECONTACT. Fig. 121—Showing Position iMaximum Coupling of TypeA Oscillation Trans-former. Fig. 122—Pancake Type Oscillation Transformer. turns of the secondary and therefore no induc-tion takes place in the secondary but in the posi-tion, Fig. 121, the lines of force cut the secondaryturns at a right angle and the coupling is maxi-mum. In all transmitting sets it is advantage-ous to have the inductance of the primaryor the secondary winding continuously va-riable, i. e., the construction must be such thatthe entire inductance can be gone over inch byinch with a sliding contact. An oscillation trans-former of this type is shown in Fig. 122. The primary and secondary windingsconsist of a spiral of copper ribbon placed edgewise on an insulating disc. Thehandle is fitted with a sliding contact which permits any amount of inductance tobe inserted in the circuit, inch by inch. The same handle that varies the induct-ance is used to draw the primary andthe secondary windings apart, thusvarying the c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
