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Brown - figure 167

A drum or cylinder having an endless spiral groove extending all around it; one half of the groove having its pitch in one, and the other half its pitch in the opposite direction. A stud on a reciprocating rectilinearly moving rod works in the groove, and so converts reciprocating into rotary motion. This has been used as a substitute for the crank in a steam engine.

Un cylindre a une rainure dans un plan oblique à son arc. Un bouton se meut d'un mouvement rectiligne alternatif dans la rainure et, ainsi, convertit le mouvement rectiligne en mouvement de rotation. A été employé en remplacement de la manivelle dans une machine à vapeur.