n abulb B, some 5 or 6 cm. indiameter. The horizontaltube and part of the verticaltube near A are of narrowbore; the lower part of thevertical tube where it joinsthe india-rubber tubing iswider. The bulb is filledwith clean dry air, and amark is made at A, eitheron the glass, or on the standbehind… … 103-104] DILATATION OF GASES. Ill Now place the bulb in melting ice; as the air cools itspressure becomes less and the mercury tends to rise above A,but, by adjusting the sliding tube, it can be kept constantlyat A. When the column has become steady, read the heightof the mercury in the sliding…
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