latter is increased, and, from 36 apparatus above the same being open and the ventila- inches at the outset, passes to 40, 44, 48 inches and with glass-covered openings. tor above the auditorium closed. After the sprinkling In the first test the ventilation device above the stage apparatus had been… … One of the Perforating Rams at Work. Ram for Testing the Resistance of the Ground, MECHANICAL COMPRESSION OF THE GROUND IN THE CONSTRUCTION OF FOUNDATIONS. open, the woven curtain being lowered. After the formly as possible, and their distance apart should steam and smoke escaping through the…
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