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James Mchardy
David Stanley Froy
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8717. McHardy, J., and Froy, D. S. April 14. Ventilating tunnels.-Relates to an air-exhausting apparatus and a system of pipes for drawing off foul air from rooms, passages, tunnels, &c. The exhausting-apparatus consists of two bellows a, b, Fig. 1, actuated by a hydraulic or other motor which is shut off automatically by a bellows h communicating with the suction pipe e when the power supplied is too great. The foul air is discharged at g. The suction pipe e communicates with the rooms by a system of branching pipes, Fig. 2, the openings of which are covered by perforated plates e<3>.
GB189808717D1898-04-141898-04-14Improvements in Ventilating Apparatus.
ExpiredGB189808717A
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