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John Douglas
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9237. Douglas, J. April 12. Forced ventilation.-Relates to a gas burner and arrangement of pipes fixed in the ceiling for drawing off foul air from churches, halls, schools, private dwellings, &c. Gas is supplied to a burner C by a pipe A and air by an aperture B. The foul air is drawn off through a series of conical and parallel pipes D and E, the end of one of which is covered by a grating F.