or hydrogen which is in, or comes into the small volume at the front end of the tube can react directly with the mercury. We have shown that when ethylene reacts directly with the mercury it does so with an initial increase of pressure. Therefore, since at the beginning of the run we have a uniform distribution of both ethylene and hydrogen, it necessarily follows that a small amount of ethylene must react with an increase of pressure. This increase is superimposed upon the decrease due to the hydrogen reaction. This is the explanation of the small change in reaction rate after the first few minutes of each run.It now becomes evident that any increase in the reaction volume or any increase of the rate of diffusion of the ethylene into the reaction volume, must serve to emphasize such a change in rate. To test this a second set of experiments has been performed in which the reaction chamber was freed from liquid mercury.The mercury pressure was then determined by placing the globule of mercury in the trap which was kept at a temperature of 0°and an arrangement for circulating the reacting gases was introduced. These experiments, which will be reported more fully in a later paper, showed definitely an increase in the decomposition of the ethylene. Supmary It has been shown that ethylene decomposes and polymerizes and a mixture of hydrogen and ethylene reacts to form ethane under the action of resonated atoms. The rate of ethane formation has been shown to be proportional to the square root of the hydrogen pressure. A mechanism for the reaction has been proposed and the results of other investigations have been correlated by means of the proposed mechanism.
the Cleveland water supply, was completed in February, 1928. The American Water Works and Electric Supply Company is also carrying on tests on a semicommercial basis. The Candy Filter Corporation, London, England, has successfully used a dechlor process over carbon for the past eighteen years.2
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