334 SECTION MECHANICS. 



The Lying-in Hospital at St. Petirsburg. Here M. le Baron de 

 Derschau, a skilful Russian engineer, has carried out the following 

 arrangements : 



Single bedded rooms, for private patients 8 



Four-bedded rooms for married women 16 



Four-bedded rooms for unmarried women 28 



The results obtained were : Volume of air got rid of per bed and 

 per hour= on average, 127 M.c. 



Volume of air introduced by special apertures = 92 M.c. 

 Guy's Hospital in London, built by Mr. Rhode Hawkins. The 

 space per bed alloted is but from 45 to 48 M. The volume of air got 

 rid of has been found to be equal to 109 M.c. per hour and per bed. 

 Fresh air is taken in by two towers, 20 or 25 M. in height. It descends 

 into subterranean vaults, where it is heated by means of circulating 

 hot-water apparatus. 



Its escape takes place by means of a central tower 60 M. high. 

 Corps Legislatif, Paris. The volumes of air got rid of per hour 

 have been : 



Salle and Tribunes 28,639 M -C. 



Lobbies, etc. 12,744 M.C. 



Total 41,417 M.C. 



Plus passages 2,500 M.C. 



The proposed quantity was but of 30,000 M.c. 

 The places to be ventilated were as follows : 



Halls, galleries, passages, staircases ... 11,354 M.C. 



Eight saloons 8,988 M.c. 



Total 20,342 M.C. 



There is a renewal of air once and a half every hour. 



Theatres. The introduction can take place by interjoists at the 

 boxes, by the cupola, and by the tympans ; and the escape at the 

 bottom of the boxes, in the passages, stair-cases, and from under the 

 orchestra seats. Use ought to be made of the lights, for the exhaus- 

 tion. 



At the " Theatre Lyrique," the quantity to be got rid of had been 

 fixed at 51.000 M.C. ; the result reached from 55,000 to 60,000 M.c. 



