This is a great image of a bell ringing
"full circle". The bell rotates about 300 degrees and the
clapper actually hits the leading edge of the bell just before it becomes
vertical and then rests on that edge. On larger bells it can take
about two seconds between strikes of the bell.
On the bottom of the this image you can see the the "stay" on
the bell headstock touching the "slider" which in turn is
mounted on the frame. This device keeps the bell from over rotating.
The action of the rope as it goes around the wheel is also clear.
When the rope goes most of the way around the wheel we are at
"back stroke".