Doctoral Thesis Cover Page — page 6: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

go L. H. REYERSON AND L. E. SWEARINGEN and then dried by bubbling twice through concentrated sulphuric acid. The ethylene was used from a tank of compressed gas which had been prepared commercially for anaesthesia. Analysis showed it to be 97% pure. It was for our purposes washed successively with water, sulphuric acid, and a solution of potassium hydroxide. It was finally dried over sulphuric acid. The helium which was used to determine the volume of the bulb was ob- tained through the courtesy of the Bureau of Mines. The sample as obtained contained about 94% of helium. The principal impurity was nitrogen. The impurities were adsorbed by passing the gas through a tube of cocoanut char- coal immersed in liquid air. The adsorption measurements were made in essentially the following manner. A sample of the gel was first weighed into the adsorption bulb, A, and the bulb sealed to the apparatus. Before making adsorption measure- ments the entire apparatus was washed with the gas whose adsorption was to be measured. An exception to this procedure was made in the case of carbon monoxide and the platinized gel. The preliminary washing was omitted in this case because the work of Taylor and Burns! had shown that the adsorp- tion of carbon monoxide by platinum had been reduced by about 63% follow- ing an initial treatment with carbon monoxide. The bulb containing the gel sample was then immersed in an oil bath which was heated to 200°, and the evacuating pumps started. In order to obtain consistent results it was necessary to adopt a uniform proceedure. The bulb was heated at 200° for a period of three hours and the vacuum pumps were operated continuously during the entire period. During the process of evacuation the gas burette would be filled with the gas which was to be adsorbed. After remaining in the burette for about two hours, the gas volume, the temperature of the water jacket and the barometric pressure were recorded. By means of the leveling tube, D, a fine adjustment to atmospheric pressure could be obtained in determining the volume of the gas in the burette. Upon completion of the evacuation process, stop-cock, E, was turned so that the connection to the pumps was broken. The oil bath was removed and the bulb brought to the temperature at which the adsorption was to be measured. Adsorptions were measured at the following temperatures: 0°, 64.5°, 100°, 138° and 218°. At o°® finely cracked ice mixed with water was used in a Dewar flask. Boiling methyl alcohol was used for the temperature of 64.5, boiling water at too°, boiling xylene at 138°, and boiling napthalene at 218°. In each case these liquids were contained in large flasks equipped with reflux condensers and in no case was the adsorption bulb permitted to come in contact with the boiling liquid, but it was bathed in the vapors from the liquid. After the adsorption bulb and contents had reached temperature equilibrium, the manometer was read and gas admitted from the gas burette through the stop-cock at the top of the burette. The gas was added in small quantities, the successive additions being made only after the manometer indicated that equilibrium had been reached. Three successive readings at 1 J. Am. Chem. Soc., 43, 1273 (1921). CORMNIECLOOOKXS (C(O)