Hirschback method

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Hirschback method [′hərsh‚bak ‚meth·əd]

(mining engineering)

A method for draining firedamp from coal seams by means of superjacent entries located 80-138 feet (24-42 meters) above the seams and supplemented by boreholes drilled at right angles to the entry walls. Also known as superjacent roadway system.

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