921.    FIELDNER, A. C., AND BROWN, R. L.  Complete Utilization of Coal and Motor Fuel.  Oil, Paint and Drug Reptr., vol. 108, 1925, pp. 12-13; Blast Furnace and Steel Plant, vol. 14, 1926, pp. 138-140, 148; Chem. and Met. Eng., vol. 32, 1925, p. 799.

      Processes for obtaining motor fuel from coal may be grouped in 3 classes:  (1) Carbonization of coal including gas manufacturing and low-temperature carbonization; (2) hydrogenation and liquefaction of coal by the Bergius process; (3) complete gasification of coal and conversion of the gases by pressure synthesis into MeOH, synthol, and other liquid combustibles.