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Device for converting oscillating into rotary motion. The semicircular piece, A, is attached to a lever which works on a fulcrum, a, and it has attached to it the ends of two bands, C and D. which run around two pulleys, loose on the shaft of the flywheel, B. Band, C, is open, and band, D, I crossed. The pulleys have attached to them pawls which engage with two ratchet-wheels fast on the fly-wheel, shaft. One pawl acts on its ratchet-wheel when the piece, A, turns one way, and the other when the said piece turns the other way, and thus j a continuous rotary motion of the shaft is obtained.