Anti-Knock Ratings of Pure Hydrocarbons

Abstract

PROF. NASH and Mr. Howes emphasise the fact that whereas their figures for trimethylethylene and diamylene were quoted for twenty per cent volume concentration, our own were for twenty per cent weight concentration. From curves obtained for these hydrocarbons, reproduced in Fig. 1, it is clear that over the range examined the relationship between weight-concentration and increase in H.U.C.R. is linear. Knowing the specific gravities, it is a matter of simple calculation to show that the discrepancy cannot be due to our use of what we regard as the only rational procedure. The specific gravity of the standard fuel was 0.725 at 60° F.