Abstract
MESSRS. BIRCH and Stansfield have been good enough to send us a copy of their letter in reply to our communication which appeared in NATURE of Feb. 23. Our remarks on the knock rating of pseudo-cumene are taken from the Aeronautical Research Committee Report and Memorandum No. 1013 (1925), in which it is stated that the addition of 5 per cent by volume of this hydrocarbon to a common No. 1 petrol lowers the H.U.C.R. of the latter to the extent of 0·4 per cent, whereas the addition of the same amount of benzene raises the H.U.C.R. by 1·0 per cent.
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NASH, A., HOWES, D. Knock Ratings of Pure Hydrocarbons. Nature 123, 526–527 (1929). https://doi.org/10.1038/123526a0
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DOI: https://doi.org/10.1038/123526a0
