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Bertin's new 30 h.p. single-cylinder pacing machine on which he will endeavour to pace a racing cyclist 100 kilometres (62.1 miles) in the hour.
Jean Bertin was a French cyclist who later built pacers which he piloted at many events in France and elsewhere.
Some of his machines were tandems, with a pilot in the front seat steering the machine while Bertin maintained control of the engine.
Sources: motorcyclemojo.com, lepetitbraquet.fr, et al
N.B. There was also a Bertin in the 1950s: André Bertin