Perry, John, 1850-1920. Spinning tops : The "Operatives' lecture" of the British association meeting at Leeds, 6th September, 1890. / by Professor John Perry.

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Perry, John, 1850-1920.

Spinning tops : The "Operatives' lecture" of the British association meeting at Leeds, 6th September, 1890. / by Professor John Perry.

Tops.

Gyroscopes.