. Carnegie Institution of Washington publication. 68 FLUORESCENCE OF THE URANYL SALTS. immersed more or less deeply in the liquid air by raising or lowering the Dewar flask. To preclude the gathering of frost or moisture on the surface of the crystal, it was kept during the entire experiment at a sufficient distance below the lip of the flask, where it was surrounded with the dry atmosphere above the slowly evaporating mass of liquid air. Measurements of the temperature were by means of a small coil of fine copper wire mounted at the same level as the crystal, so as to have always, as nearly a
. Carnegie Institution of Washington publication. 68 FLUORESCENCE OF THE URANYL SALTS. immersed more or less deeply in the liquid air by raising or lowering the Dewar flask. To preclude the gathering of frost or moisture on the surface of the crystal, it was kept during the entire experiment at a sufficient distance below the lip of the flask, where it was surrounded with the dry atmosphere above the slowly evaporating mass of liquid air. Measurements of the temperature were by means of a small coil of fine copper wire mounted at the same level as the crystal, so as to have always, as nearly as possible, the temperature of the latter. Changes in the resistance of the coil were indicated on the sheet of a Callender recorder, carefully calibrated to read directly in degrees centigrade and adjusted for a range from +20° to —200°.. A X. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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