. The principles of ventilation and heating and their practical application. or less impureand offensive, as it communicated freely by large stairways with thebasement and cellar, in which were water closets, bath rooms, a largerestaurant with its kitchen, and the engine rooms. The large sewer,which came beneath the building, was unventilated and untrapped. VENTILATION AND HEATING. 125 The result of all this was that various unpleasant odors were at timesperceptible in the Hall, and were attributed to almost every cause butthe right one. This aspirating fan is now connected with the corridors,
. The principles of ventilation and heating and their practical application. or less impureand offensive, as it communicated freely by large stairways with thebasement and cellar, in which were water closets, bath rooms, a largerestaurant with its kitchen, and the engine rooms. The large sewer,which came beneath the building, was unventilated and untrapped. VENTILATION AND HEATING. 125 The result of all this was that various unpleasant odors were at timesperceptible in the Hall, and were attributed to almost every cause butthe right one. This aspirating fan is now connected with the corridors,as shown in the figure, and the result has been very satisfactory. The total area of clear opening for the admission of fresh air on thefloor of the Hall is about 300 square feet, and in the galleries about 125square feet. The total area of openings in the ceiling for the dischargeof foul air is about 670 square feet, being three times as much as isnecessary. This is, however, a matter of minor importance, since theamount of flow is practically controlled by the ^^^^^^^^^^^^ Figure 29.—TRANSVERSE SECTION THROUGH SOUTH WING, U. S. CAPITOL. yi.—Main Hall. I C—Main Fresh-Air Duct. B.—Space over Hall. I D.—Fresh-Air Supply to Galleries. £,— Fan. Through the courtesy of Mr. Lannan, the Engineer of the House, Iam able to present a table of data (see page 128), showing the workingof the apparatus during the month of Februarv^, 1881. It will be foundinteresting to compare this table with the table following, which showsthe condition of the working of the apparatus under the old system ofexhaust fans in November and December, 1877, after some of the recom-mendations of the board had been carried out and a considerableimprovement effected. The results obtained are still better demonstrated by the results ofsome air analyses, made at the request of the writer, in January, 1S80,by Dr. Charles Smart, U. S. A. After the House had been in session 126 VENTILATION
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