Quotation from: General Science

Written by: Bertha M. Clark


A relatively simple complex machine called the crane (Fig. 116) maybe
seen almost any day on the street, or wherever heavy weights are being
lifted. It is clear that a force applied to turn wheel 1 causes a
slower rotation of wheel 3, and a still slower rotation of wheel 4,
but as 4 rotates it winds up a chain and slowly raises _Q_. A very
complex machine is that seen in Figure 117.


[Illustration: FIG. 115.--A simple derrick for raising weights.]

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