An experimental study is made of subharmonic oscillations in systems having |θ|θ, θ3, and |θ3|θ as the nonlinear terms in the restoring force; θ represents displacement. In a system with a restoring force θ3 the subharmonic of order one third was the only subharmonic observed. In a system with |θ|θ or |θ3|θ as the restoring force, subharmonics of order one half and one third were observed.

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