A rope hangs from a lever or wheel attached to the headstock, and when the bell ringer pulls on the rope the bell swings back and forth and the clapper hits the inside, sounding the bell.
A rope hangs from a lever or wheel. This lever or wheel is attached to the headstock. The bell swings back and forth. The bell ringer pulls on the rope. The clapper hits the inside. The clapper is sounding the bell.