On aniline and its derivatives : a treatise upon the manufacture of aniline and aniline colours (1868)
Reimann, M, Hofmann, August Wilhelm von, 1818-1892, Laire, Georges de, Girard, Adam Charles, 1837-, Crookes, William, 1832-1919 · New York : J. Wiley and Son · leaf 23
tigated, and are sometimes sold under the name of photogen oil. The retort now contains a black substance, solid when cold, and liquefied by heat ; it is called asphalt. The benzols obtained at first are called light hydrocarbons, to distinguish them from the heavy hydrocarbons, photogen and solar… … a. Thermometer, b Opening closed by a screw, c. Boiler containing the tar. d. Cooling apparatus. B 2
Aniline · Coal-tar colors
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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