Show Petroleum ek j if Pe Petroleum leum bac ha Iu been en established elta cS as a an important source of of Chem chemi cal compound with which created an en amazing array of diverse divers and useful material materials Glyce Glycerine n ine for fat example can now be produced ID I'D giving livID assurance of a stable supply of this product in past part yearn tan year largely a byproduct of soap sap manufacture I from which TNT if i made was formerly ob oh- oh obtained tamed entirely as a a product by-product of coal carbonization but now may mar be synthetically as i lie well well from petroleum hydrocarbons |