Heart -wheel

Zell's Condensed Dictionary · 1879 · p. 23

(-wēl.) (Mach.) In cotton-spinning machinery, a mechanical contrivance whereby a circular motion becomes by conversion an alternating rectilinear one. [s. 444] Heart - wood. (Bot.) Same as DURAMEN Heart - wood. (Bot.) Same as DURAMEN, q. v. [s. 444]