. The Popular science monthly . Photo, C. R. Toothaker, Phila. Commercial Cones on Edge of Trinidad Lake. TRINIDAD AND BERMUDEZ ASPHALTS 31 those which are soluble in light petroleum naphtha, and the remainderwhich are insoluble, although the percentage will depend to a certainextent on the character of the solvents. The softer or oily portion whichis soluble in naphtha is, for 88° naphtha at air temperatures, about 63per cent. The components of Trinidad asphalt and of other bitumens,which are thus soluble, have been denominated by the writer Mal-thenes/ a name to be applied to th
. The Popular science monthly . Photo, C. R. Toothaker, Phila. Commercial Cones on Edge of Trinidad Lake. TRINIDAD AND BERMUDEZ ASPHALTS 31 those which are soluble in light petroleum naphtha, and the remainderwhich are insoluble, although the percentage will depend to a certainextent on the character of the solvents. The softer or oily portion whichis soluble in naphtha is, for 88° naphtha at air temperatures, about 63per cent. The components of Trinidad asphalt and of other bitumens,which are thus soluble, have been denominated by the writer Mal-thenes/ a name to be applied to this class of hydrocarbons, not asrepresenting any homogeneous entity, but merely descriptive of theirgeneral character. The term petrolenes has also been used to cover thissame class of Photo, C. R. Toothaker, Phila. Commercial Buildings, Trinidad. The hydrocarbons and their derivatives which are insoluble havebeen called asphaltenes. The malthenes of Trinidad asphalt are distinguished by the fact thatthey are of an extremely sticky and cementitious nature, and notmerely oily as is often the case with material of similar consistencyprepared from petroleums. The value of any bitumen or combinationof bitumens for highway construction depends on the character of themalthenes of which it is composed, and the relative proportion of theseto the asphaltenes. Where the former are not present in sufficientamount, it is necessary to add to the asphalt material in which malthenespredominate to attain a proper consistency. This is known as fluxingthe asphalt, and in the case of that of Trinidad, owing to the presenceof the large amount of malthenes of a sticky nature, it can be accom- 32 THE POPULAR SCIENCE MONTHLY
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