xle of the driv- rectangle, e, f, g, h, represents the outline of the base BY W. F. DURFEE. There is a general belief among mechanicians that ing wheels was the drum, b, about which was wound of the shrine; its three supporting wheels being indi- the rope, a, which passed upward through the space,… … Fig. 5. about 2,000 common axis, years ago. In a ¢, of the driv- ring, c, of the ponderous lead weight, d, which rested ing wheels, o p and s t, must have an inclination ina his work descriptive of automatic or self-moving ma- vertical plane fixed by the diameters of these wheels. upon a quantity…
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