to differ much readers. It consists of two revolving vanes or abut- enter and displace the air, the balloon will rise or fall from Fig. 3. Fig. 5 shows the last constructed curve, ments geared together so as *o keep up constant con- according as the gas is heavier or lighter than air. which far… … balloon and an equal volume of air at the same tem- have taken a license to manufacture, and, we believe, perature and pressure. The apparatus may be con- of a pair of half cylinders. Its success is well known have supplied several to her Majesty's government, structed of any desired delicacy, and…
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