681787.fig.0012a
(a)
681787.fig.0012b
(b)
Figure 12: Regions in the “clappering plane” for which a bell can ring (a)right and (b) wrong. Colour shading indicates the lift-off angle (in degrees) at which the clapper first leaves the surface of the bell on each stroke. White symbols indicate the positions of the bells from Figure 9.