. Radioaktivität der Thermalwasser des Yellowstone National Park . E Glasschläuche (T) mit einem Gewinde Messing Ring (R), intowhich eine abnehmbare Messingkappe (C) Schrauben überragt. Ein kurzes Stück Glasstutzen durchläuft ein Loch in der Kappe und ein Messingstab (r) wird mit Schwefel oder Wachs in das Glasrohr gezementiert. Das untere Ende der Messingstange erstreckt sich in einen Schwefel-Stab, der als Insu-lating-Material dient, um das Blattsystem zu stützen. Die Platte (p), an der das Blatt befestigt ist, ist für einen kurzen Abstand in das andere Ende des Schwefelstabes eingebettet. Eine Besonderheit des Elektroskops ist das d
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. Radioactivity of the thermal waters of Yellowstone National Park . e glass tubing (T) surmounted by a threaded brass ring (R), intowhich a removable brass cap (C) screws. A short piece of glasstubing passes through a hole in the cap and a brass rod (r) is cementedin the glass tube by means of sulphur or wax. The lower end of thebrass rod extends into a rod of sulphur, which serves as the insu-lating material to support the leaf system. The plate (p) to whichthe leaf is fastened is embedded for a short distance in the other endof the sulphur rod. A special feature of the electroscope is the device a Jour. Phys. Chem., vol. 9, 1905, p. 321. b Am. Jour. Sci., 4th ser., vol. 18, 1904, p. 97. 8 RADIOACTIVITY OF THERMAL WATERS for charging it.a A piece of soft iron wire (w) is suspended from ahook on the brass rod (r) which projects out through the screw cap.The wire extends just below the sulphur insulator and terminates ina right-angle bend. In its normal position the wire does not touchthe plate carrying the leaf, but by bringing a magnet near the wire, . Figure 1.—Electroscope. it can be deflected so as to make metallic contact between the rod (r)and the plate (p). All of the brass joints are soldered and the otherjoints are made air-tight by means of hot wax, except that betweenthe brass ring and cap, where a rubber washer excludes the air. Theelectroscope is provided with two good brass stopcocks. a The same device was used by Strutt, Phil. Mag., 6th ser., vol. 5, 1903, p. 680; and by Boltwood, loc. cit OF YELLOWSTONE NATIONAL PARK. 9 Aluminum leaf was used in the instruments. It was readily andfirmly fastened to the carrying blade by moistening the upper por-tion of the blade and then pressing it firmly against the leaf. Thesulphur rod and the aluminum leaf successfully withstood the trans-portation by rail and in the field. In two of the electroscopes theoriginal leaf served throughout the entire series of field experiments.The volume of the electroscopes was, r
