THE testing of coals for their suitability in use, even after many years of effort, continues to give rise to investigation. This is due to the great economic importance of fuels, change in methods of utilization, and also to the fundamental complexity of the nature of coal. Unlike many raw materials, every coal contains several constituents, recognizably distinct, which vary in composition and character according to their origin and geological age. Moreover, they contain inorganic matter which varies widely in chemical composition and physical properties.
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HODSMAN, H. ANALYSIS AND TESTING OF COAL. Nature 150, 667–668 (1942). https://doi.org/10.1038/150667a0