Powdered Coal as a Fuel (Classic Reprint) - Softcover

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Excerpt from Powdered Coal as a Fuel

Powdered coal weighs 38 to 45 lb. Per cubic foot, although the solid particles have a Specific gravity between and The free surface of a pile at rest makes an angle of 34 to 38 degrees with the vertical, if dry. These properties do not vary much with the grade of coal.

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