To determine the significance of fluorescence and similar phenomena upon the optical measurements, solutions of different concentrations of Shell sample 100 in Nujol were made, and their optical densities (log 1/T) were measured on the Hardy spectrophotometer. The results showed that the oils obeyed Beer's law.Further work in which the transmission curves are being expressed by an equation is being carried on to provide constants that are a function of the color of the oils. In this manner it is hoped that a more definite correlation between the color and other properties of the oils may be obtained.

No abstract

4 method of analysis for gas mixtures which consist largely-of hydrogen and of small amounts of carbon monoxide, nitrogen, methane, and higher hydrocarbons is described. The higher molecular h ydrocarbons are frozen at -180" C. and the hydrogen is removed by diffusion through a palladium tube at 300" C. The carbon monoxide and the methane are then burned S THE course of a n investigation of the effect of corona I discharge on insulating oil, it was necessary to obtain an accurate knovledge of the composition of the generated gas. This type of gas mixture is largely hydrogen with a small amount, not over 5 per cent by volume, of niethane and higher molecular hydrocarbons, a still smaller amount of carlion monoxide, not over 1 per cent by volume, and nitrogen, T I ith no oxygen present. The conventional method of