. The principles of ventilation and heating and their practical application. n alwaysbe collected in this building, because of its coolness, freshness and com-fort. I have not been able to obtain any detailed results of observa-tions of the work actually done as regards movement of air and heatingor cooling it, but as the whole is under the direction of a competentengineer, it is to be hoped that we shall some day have a detailed reportwhich will furnish data of much scientific interest and value. The Metropolitan Opera House in New York City is another largebuilding of this class in which exc
. The principles of ventilation and heating and their practical application. n alwaysbe collected in this building, because of its coolness, freshness and com-fort. I have not been able to obtain any detailed results of observa-tions of the work actually done as regards movement of air and heatingor cooling it, but as the whole is under the direction of a competentengineer, it is to be hoped that we shall some day have a detailed reportwhich will furnish data of much scientific interest and value. The Metropolitan Opera House in New York City is another largebuilding of this class in which excellent results have been secured, sofar as heating and ventilation are concerned. The apparatus in this 134 VENTILATION AND HEATING. case was devised by Mr. Frederic Tudor, under direction of Mr. Cady, of New York, the architect, and I take the following de-scription and illustrations, by permission, from the Sanitary Engineerof December 6 and 13, 1883, having personally verified their accuracy: The principle involved is plenum ventilation, the object being to. Figure 33—METROPOLITAN OPERA HOUSE, NEW YORK CITY.—GROUND PLAN. have an excess of air entering the building to that which is leaving itby the regularly provided foul-air outlets. The result of this is to havea pressure within the building slightly in excess of that of the air with-out the walls, so as to insure an outward current through crevices of VENTILATION AND HEATING. 135 doors or windows or through accidental openings. To accomplish thisin a practical manner, a blowing engine must be used, and the supplyof air must be almost unlimited. To this end the shaft (at the right of
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