92 Dr. Ure on Disinfection. 



The cask A, fig. 1 and 2, is destined to receive the chloride 

 of lime and muriatic acid. The strong bleaching salt with 

 which the Messrs. Tennant supply the London market, chiefly 

 for the use of the paper-makers, contains on an average about 

 29 or 30 per cent, of chlorine gas, which it most readily gives 

 out on the affusion of any liquid acid. I find that one pound 

 of such chloride requires for saturation of the lime, one pint 

 (imperial measure) of the muriatic acid of the London shops, 

 of specific gravity 1 . 160, and evolves a cubic foot and a half 

 of pure chlorine. This volume diluted with about twelve times 

 its bulk of air, is adequate to the disinfection of a small apart- 

 ment. It will be convenient in practice to introduce at once 

 into the cask A by the hole B, six or seven pounds of the 

 chloride, diffused among seven or eight pints of water, and then 

 to call forth the chlorine as it is wanted for distribution, by 

 successive affusions of muriatic acid through the syphon-funnel 

 C, remembering that every pint of the acid will disengage about 

 a cubic foot and a half of the chlorine. The gas thus liberated 

 will pass along the horizontal pipe D, fig. 1, into the side of 

 the wide vertical pipe E, and falling down into the ventilating 

 vessel, will by the motion of its central fanner F be diluted with 

 air in any desired measure, according to the velocity of the 

 rotation. The air of dilution is drawn in at the axis through 

 the open upright pipe E, and the mingled gas is blown forth 

 through the pipes G G, whence it may be conducted and 

 applied whithersoever the operator may choose, upwards, down- 

 wards, or horizontally, by connexion with wooden or leaden 

 pipes of communication. 



Fig. 1 exhibits an apparatus, which may be got up by any 

 ship-carpenter in a day or two with a couple of casks, one 

 small and the other large. This has been actually done at 

 Woolwich. Instead of turning round the axis H of the fanner, 

 by a horizontal motion of the hand, it may be made to revolve 

 more conveniently by a vertical motion, provided the upper 

 end of the axis be furnished with a couple of bevelled-toothed 

 wheels, placed at right angles to each other, as shown by the 

 dotted line L. The stop-cock M, serves to draw off a phial- 

 full of the gaseous mixture, for analysis, by water or milk of 

 lime. 



