. Conduction of electricity through gases and radio-activity; a text-book with experiments . ch water vapor will condense when moist air is suddenlycooled by expansion. 77. Expansion Apparatus.—The later and improved formof apparatus designed and used by Wilson is shown in A is the vessel in which the expansion takes place. Itconsists of a heavy glass cylinder ab about 16 or 18 cm. indiameter and about 8 cm. in height. The ends of the cylinderare ground flat so that the brass plates cd and ef fit tightlyagainst the ends. Between these plates and the ends of thecylinder thin rubber wash
. Conduction of electricity through gases and radio-activity; a text-book with experiments . ch water vapor will condense when moist air is suddenlycooled by expansion. 77. Expansion Apparatus.—The later and improved formof apparatus designed and used by Wilson is shown in A is the vessel in which the expansion takes place. Itconsists of a heavy glass cylinder ab about 16 or 18 cm. indiameter and about 8 cm. in height. The ends of the cylinderare ground flat so that the brass plates cd and ef fit tightlyagainst the ends. Between these plates and the ends of thecylinder thin rubber washers should be placed and the twoplates drawn tightly together against the ends by six or eight 118 EXPANSION APPARATUS II9 brass rods rr acting as bolts with nuts. If this does not makethe vessel air-tight the joints may be waxed. From the middleof the lower plate ef a brass tube T, about 7 cm. in diameterand 25 cm. long, leads. The lower end of this is closed by alarge rubber stopper 5. This tube also contains a closely fittingpiston P which consists of a light brass tube with a hemi-. spherical top. This piston should be made to slide easily insidethe tube. Through the stopper 5 another glass or brass tubeleads into an air-tight chamber B and from this leads anothertube T2 to a large glass receiver R, which is connected to anair-pump. For this purpose a large glass bottle with two out-lets may be used. The opening of the tube T2 is closed by arubber stopper S1 attached to the end of a rod rx which passesout through a closely fitting tube in the bottom of the chamberB. A piece of rubber tubing t should fit tightly over the endof the tube and the rod 1\ so that the rod may be moved 120 IONS AS NUCLEI through the tube without allowing air to enter B. The stopper5\ and attached rod are held tightly against the end of thetube T2 by a stiff spiral spring. From the upper chamber Aanother small glass tube T3 leads to a manometer M by whichthe pressure in A may be measured when the
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