Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
il machines for this purpose are almost without number—volumes would be required to describe them. Yet, in this country,as well as others, some of the earliest and crudest of these are still em-ployed, as the well-sweep, windlass, and rope and pulley. In fact, few,if any, machines have undergone a… … 16S. Figure 10.—liifting-wheel.—This is a wheel consistingof a series of hollow or tubular spokes, bent at right angles at the ex-tremities, to form cups or buckets, TL. The wheel is set so that whenit is revolved by hand or other power, these cups will be filled with thewater to be elevated. As…
Physics · Astronomy
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