. The principles of ventilation and heating and their practical application. ^^^^^^^^^^^^ 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 o
. The principles of ventilation and heating and their practical application. ^^^^^^^^^^^^ 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 AND HEATING. ^\VVvV.\\\\\V<^S. Figure 30.—SECTION THROUGH AIR DUCTS AND HEATING APPARATUS OFSOUTH WING, U. S. CAPITOL. yl .—Cold-Air —Heating —Mixing Chamber. Z>.—Fresh-Air —■.—Fresh-Air Shaft. VENTILATION AND HEATING. I27 3^ hours, with 250 persons present on the floor and 300 in the gallery,the proportion of carbonic acid present in the air at the level of thedesks was found to be parts per 10,000. As a portion of this carbonic acid was derived from the undergroundduct, the amount of carbonic impurity is really not excessive. It shows,however, that the distribution of the fresh air in the Hall is not asprompt and uniform as it should be, since with the amount of air pass-ing into and out of the Hall, and the number of persons present, theamount of carbonic impurity present should not have exceeded 6.;^parts per 10,000. The Hall of the House of Representatives is a room 139 by 93 feet,and ^6 feet high, with galleries an
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