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A compound pendulum may be constituted to oscillate about one axis only, in which case it is nonreversible and applicable only for relative measurements.

Problems relating to the direction and amount of velocity producing fracture or fissures.Problems relating to the single or multiplied oscillations of bodies, considered as compound pendulums.Problems referable to the theory of projectiles.

He then constructed a similar compound pendulum with only one knife edge, and swung it to determine relative values of gravity at a number of stations in the British Isles.

The reversible compound pendulum has served for the absolute determination of gravity by means of a theory developed by Huygens.

Invariable compound pendulums with single axes also have been used to determine relative values of gravity by comparative times of swing.