The Cleveland Open Cup Apparatus (I. P. 36 and A. S. T. M. D92 modified) is used for determining the flash and fire points of liquids. It is not usually used for liquids with an open cup flash point below 79oC and also is not used for fuel oils
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}