. Carnegie Institution of Washington publication. 172 CONDUCTIVITY AND VISCOSITY IN MIXED placed at least 2 or 3 cm. from the walls of the bath, to insure uniform tempera- ture; and to render the graduations on the viscometer more clearly visible they were filled with India ink, which was then rendered insoluble by heating. The thermometer bulb was always placed between the bulb of the viscometer and the wall of the bath, in order to make certain that that portion of the bath was at the proper temperature. This precaution is necessary, since it was determined by a number of experime
. Carnegie Institution of Washington publication. 172 CONDUCTIVITY AND VISCOSITY IN MIXED placed at least 2 or 3 cm. from the walls of the bath, to insure uniform tempera- ture; and to render the graduations on the viscometer more clearly visible they were filled with India ink, which was then rendered insoluble by heating. The thermometer bulb was always placed between the bulb of the viscometer and the wall of the bath, in order to make certain that that portion of the bath was at the proper temperature. This precaution is necessary, since it was determined by a number of experiments that if any very large amount of water is allowed to collect next to the wall of the bath, its temperature may rise as much as one-half a degree above zero. With a little care, however, it was found possible to keep the portion of the bath immediately surrounding the viscometer constant to within less than one-tenth of one degree. The 25° bath was similar to that de- scribed by Jones and It was found desirable to place a small quantity of potassium dichromate in this bath, since this not only prevented the accumulation of organic growth in the bath, but also the yellow color made the graduations on the instrument placed in the bath much more clearly visible. This bath was easily maintained con- stant to within one-tenth of a degree, by means of a small flame regulated by a Mohr pinchcock. SOLVENTS. WATEK. The water used was purified as follows: Ordinary distilled water was dis- tilled from potassium dichromate and sulphuric acid. It was then distilled a second time from potassium dichromate and sulphuric acid, into barium hydroxide, from which it was finally distilled into a bottle which was protected from the carbon dioxide of the air and other impurities, by a tube filled. 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 perfectl
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