. Practical wireless telegraphy; a complete text book for students of radio communication . ARMATURE Fig. 73—Circuit of Automatic Starter for Marconi Yi K. W. 120 Cycle Set. functions. If the source of power is cut off, magnet M releases the handle of the starterwhereupon it returns to the zero position, breaking the circuit to the armature. 56. Automatic Motor Starters.—It is often essential to install a motorgenerator at a point remote from the wireless cabin in order that the noisefrom its operation may not interfere with the reception of wireless signals. Ininstances of this kind automatic
. Practical wireless telegraphy; a complete text book for students of radio communication . ARMATURE Fig. 73—Circuit of Automatic Starter for Marconi Yi K. W. 120 Cycle Set. functions. If the source of power is cut off, magnet M releases the handle of the starterwhereupon it returns to the zero position, breaking the circuit to the armature. 56. Automatic Motor Starters.—It is often essential to install a motorgenerator at a point remote from the wireless cabin in order that the noisefrom its operation may not interfere with the reception of wireless signals. Ininstances of this kind automatic motor starters are employed, which are con-trolled from a distant point by pressing a small button or closing a small starters possess the advantage that the acceleration of the- starting handle isuniform, and there is, therefore, no danger of burning out the armature or melt-ing the fuses during the starting of a motor. 110 VOLT ,_J7WW\AAa1 J \ J. 5ERIES. ^1 RES. AAMAAAr Fig. 74.—Circuits of Automatic Motor Starter for Marconi 1/2 K. W. 500 Cycle Set. (See Fig. 255). There are numerous types of automatic starters on the electrical market butonly those used in modern Marconi sets can be given consideration here. _ The complete circuit of the single step automatic starter is shown in the diagram ofFig. 75. It_ is employed in connection with the yi K. W. 120 cycle Panel transmitters ofthe Marconi Company. A single resistance unit R-1 is connected in series with the brushes MOTOR GENERATORS/ 61 E and F of the armature. The solenoid winding S connected in shunt to the motor arma-ture draws up the plunger C which in turn shunts the coil R-1 through the contacts A andB. When the main D. C. line switch is closed, current flows to the motor armaturethrough R-1 and as the counter E. M. F. of the armature increases, the solenoid windingbecomes more strongly magnetized, drawing up the plunger, which cuts out the resistancecoil.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
