File:Radioactivity of the thermal waters of Yellowstone National Park (1909) (14570928779).jpg

Identifier: radioactivityoft00schl (find matches)
Title: Radioactivity of the thermal waters of Yellowstone National Park
Year: 1909 (1900s)
Authors: Schlundt, Herman, 1869-1937 Moore, Richard B. (Richard Bishop), 1871-1931
Subjects: Geothermal resources Radioactive substances in rivers, lakes, etc Freshwater radioecology
Publisher: Washington : G.P.O.
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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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,
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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, respectively, 490, 590, and 600cubic centimeters. A rod of vulcanite a

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