eresting to our another gas of different specific gravity is allowed to out the curves. It will be seen not to differ much readers. It consists of two revolving vanes or abut- enter and displace the air, the balloon will rise or fall ments geared together so as to keep up constant con- according as… … and also the radii. These being fully described in pat- Fig. 6—ROOTS’ BLOWER. ent No. 10,328, 1885, it will be unnecessary to describe them more fully here. An exterior view of the blower scale or the other, which thus indicate the difference is given in Fig. 6. in weight between a volume of gas…
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