DIRECTIVE ACTION OE ONE QUARTZ CRYSTAL ON ANOTHER. 
249 
to one end of a wooden lever, the other end of which was attached to a sliding collar 
on the axle of the motor. To this collar were fastened the upper ends of the loaded 
springs of the governor, as sliown in the figure. If the speed increased, the loads 
Fig. 2 
flying out pulled the collar down aiid so raised the wire out of the mercury-cups, and 
broke the circuit. As the speed diminished, the wire again dipped into the mercury 
and re-established the current. To diminish sparking the mercury was covered with 
alcohol, and the two cups were permanently connected by a high resistance shunt. 
VOL. CXCII.—A. 2 K 
