. Practical wireless telegraphy; a complete text book for students of radio communication . e automatic starter are _energized by direct current from the main D. C. line and operated by a distant control this switch is closed, the solenoid A is energized and moves the contact arm Cradially in a vertical plane, perpendicular to the board, which cuts in the single resistance unit mounted in the re-sistance box behind thepanel. As the speed of themotor generator in-creases, the currentfalls off, and the poten-tial difference acrossthe armature it reaches normalvalue, the so

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. Practical wireless telegraphy; a complete text book for students of radio communication . e automatic starter are _energized by direct current from the main D. C. line and operated by a distant control this switch is closed, the solenoid A is energized and moves the contact arm Cradially in a vertical plane, perpendicular to the board, which cuts in the single resistance unit mounted in the re-sistance box behind thepanel. As the speed of themotor generator in-creases, the currentfalls off, and the poten-tial difference acrossthe armature it reaches normalvalue, the solenoid B isenergized and drawsthe contact arm F, cut-ting out the connects full linevoltage across themotor. I^ri IS^^ 1 ;mi,-,L TiJiriisr, jB lif -mima COHO«..-Jf ^^B ^^m^- u ^^: .Z! iflii wSBBSm - B|Ft m H|B|a|. oscillhiok BHP9 T IRSNSMJRMEK imS ami i •M wmm. 1 1 o«fi 1 * t^ mirrS. m^ < IC^S«o. ■ ROTARY SPARK, Vt, V 6AP 1 ■ ? W 0 4^- \ ^ ^y* n n^^^ ^ Fig. 259- -Rear View of the Marconi 5^ K. W. 500Panel TransmiUer. Cycle HSNFIM A C Ti 74 Ps P6 P?@ @ @ @ 0

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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917