Abstract

A technique for preparing specimens of coal for electron microscopy has been developed. The usual thin-section or peel methods of coal petrography are inadequate. The coal specimens are etched in chromic acid-sulfuric acid and the structures thus revealed are reproduced in extremely thin replica films of Formvar (polyvinyl formal). Electron micrographs of microspores in attrital coal and cell structures in anthraxylon are illustrated. Details are revealed that are beyond the limits of the optical microscope.

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