"Owing to the friable nature of coal it is frequently very difficult to prepare samples for examination under the microscope, especially when a complete profile through the seam is required. In an attempt to overcome these difficulties this paper outlines a procedure whereby coring of the sample in the laboratory can be carried out without fear of its disintegration. Impregnation and the insertion of a central steel support to the sample before cutting produces a core which is durable and which can serve as a permanent record of the petrographic structure of the seam."

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