ATMOSPHERIC PRESSURE BETWEEN 104 C. AND 115' C. 



407 



This space was provided with an inlet, E, connected directly on to the pressure 

 regulator, and the steam entering here, passed between the double walls of the 

 jacket and out at F into the steam separator, G, whence it entered, through the 

 throttle, T, into the side-tube. 



On its passage through the tightly packed gauze discs in the side-heating tube 

 the steam was heated up to the temperature of the jacket. It then entered the 

 space surrounding the calorimeter, whence it finally passes down the flow-tube, Y, 

 to the condenser fixed on to Z. In fig. 7, which represents diagrammatically the 

 arrangement thus described, it will be noticed that the cylindrical space inside the 



<r\ 



d 



Fig. 7. 



double walls of the main jacket is divided into two compartments by a brass disc, K. 

 This was soldered round the inner tube about 5 cm. from the upper end. The 

 function of this disc is to prevent the steam impinging on the rubber cork closing 

 the upper end of the tube, and thus being cooled. 



Any slight cooling due to the steam striking the lower split cork is of no importance, 

 since the steam would be warmed again during its passage up between the calorimeter 

 and the surrounding jacket. The whole of the jacket, the separator, and the con- 

 necting tubes were heavily lagged with felt. The main jacket containing the 

 flow-tube was fixed vertically. The side-heating tube was thus slightly inclined 



VOL. ccxv, A. 3 i 



