The switching circuit is coupled to the voltage supply for energizing {TAIL ~ the primary winding} only to achieve {HEAD ~ a high speed}, energizing only the secondary winding to achieve a medium speed, and energizing both the primary winding and the secondary winding in series with each other to achieve a low speed 
The switching circuit is coupled to the voltage supply for energizing { TAIL ~ the primary winding } only to achieve { HEAD ~ a high speed } , energizing only the secondary winding to achieve a medium speed , and energizing both the primary winding and the secondary winding in series with each other to achieve a low speed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH