Abstract
A form of Newton's cradle is described in which spheres of different sizes can be used and overall collision times measured using a BBC microcomputer. It is shown that collision times cannot be explained on the basis of collisions between initially non-touching pairs of spheres, but that Hertz's theory is applicable. As the collision perturbation passes down the chain, the additional collision times for subsequent collisions are half the collision time for the first collision.
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