330 



WARMING AND VENTILATION. 



cupola was as much as 1,301,000 cubic feet for 736 places, equal to 1,818 

 cubic feet to a place. For the whole audience-room, coutaiuiug 1,472 

 places, the total amount of air removed on an average during the five 

 evenings in May, 18G3, when the observations were made, was as much 

 as 1,970,000 cubic feet, or 1,338 cubic feet instead of 1,060, which was 

 all demanded. The total amount was even raised on December 3, 1862, 

 to 2,121,000 cubic feet an hour. 



137. Maintenance of equality of temperature in the different galleries. — 

 I have given in my investigations in regard to ventilation* the results 

 of experiments which have been made under very different temperatures, 

 and which have shown that the results obtained have exceeded what 

 was required as to the amount of air removed from the room at the 

 different galleries. The results relative to keeping up the temperature 

 have not been less satisfactory. In fact, by means of this regular ven- 

 tilation, the temperature at the different galleries has been maintained 

 at a very remarkable state of uniformity, as shown by the following 

 results for the first and fourth galleries, which alone will be cited here: 



Date. 



May 24, 1863 

 May 25, 1803 

 May 26, 1863 

 May 27, 1863 

 May 28, 1863 

 May 29, 1803 

 May 30, 1863 



sa 



o Y. 

 52.25 

 55.85 

 55.85 

 59.90 

 62. 60 

 67.10 

 69. 80 



l3 



■*^ p 6 



oo cS ^ 

 t- aj -' 



o Y. 

 69.10 

 71.60 

 71.60 

 75.02 

 75. 92 

 76.10 

 78. 26 







o F. 



69.80 



74.66 



72.05 



75.02 



76.64 



77. 36 



80.06 



It is well to repeat that in a place strongly ventilated a temperature 

 of 75° does not feel unpleasant, and that if the direct external air- 

 openings required for the summer season have been made it will be easy, 

 if required, to obtain a still smaller difference between the external and 

 internal temperatures. 



At the old Opera, the Italian Theater, and most of the unveutilated 

 theaters, it is not unusual to observe temperatures of 95<^ and 105°. 



138. Temperature on the stage. — When the heaters designed to warm the 

 stage are well managed, a proper degree of temperature may always be 

 maintained there. Thus, in November, 1863, with an external temper- 

 ature of 39°, was obtained — 



o Y. 



On the stage - GO. 02 



In the orchestra-stalls 70. 88 



la the gallery-boxes, (average) 72. 32 



In the amphitheater, (fourth gallery) 73. 94 



*Eludes sur la Ventilation, vol. 2. 



