. Scientific American Volume 88 Number 12 (March 1903). ure towhich the finger, 16, is attached will be swung forwardso that it projects slightly in front of the polar projec-tion of the magnet, 14. When this occurs the springsin clearing the finger, 16, are forced from the pole ofthe magnet, 14, when they will again assume theirvertical position in virtue of their elasticity and willpass into the U-shaped groove at 17, remaining thereuntil the disk has completed its cycle. The purpose of this device is to establish contact atcertain prescribed intervals with the induction coil,20, and the osc
. Scientific American Volume 88 Number 12 (March 1903). ure towhich the finger, 16, is attached will be swung forwardso that it projects slightly in front of the polar projec-tion of the magnet, 14. When this occurs the springsin clearing the finger, 16, are forced from the pole ofthe magnet, 14, when they will again assume theirvertical position in virtue of their elasticity and willpass into the U-shaped groove at 17, remaining thereuntil the disk has completed its cycle. The purpose of this device is to establish contact atcertain prescribed intervals with the induction coil,20, and the oscillator which emits the electric is done by means of a number of contact points,18, fitted to the circumference of the frame support-ing the disperser; these consist of two contact springsinsulated from each other; when the steel springs, 9,move within the ring, 11, they just clear the contactsprings, but when passing in the U-shaped groove, 12, &,J~J*rT Fig. 3.—The Transmitter, Showing ConnectionsBetween Disperser and Induction Fig. l.—Wain Apparatus of the Bull System of selective Wireless BULL SELECTIVE SYSTEM OF WIBELESS TELEGBAPHY. © 1903 SCIENTIFIC AMERICAN, INC. 2o6 Scientific American March 21, 1903. they project sufficiently to make contact and thereforeclose the circuit operating the induction coil. If the magnet, 8, is not excited and the disk is re-volved the steel springs will slide within the ring andall the contact points will be open; if on the otherhand the key is closed and a current impulse is sentthrough the magnet, the steel springs sliding throughthe groove make connection with each of the contactpoints in passing them. The electrical connections be-tween the steel springs and the contact points and theinduction coil and oscillator system is clearly shownby the dotted lines and it is evident that upon contactbeing established between a steel spring and the pointsthe circuit will be closed and the current from the bat-t
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