ATMOSPHERIC PRESSUEE BETWEEN 104 C. AND 115 C. 



405 



through B to the burner. In the tubes, A and B, there are T- connections which are 

 joined by a rubber tube, C, on which is a screw-down stop-cock, whereby the amount 

 of gas going through this bye-pass can be adjusted. 



Steam, generated in the boiler, is led directly through the tube, D, into the other 

 limb of the U-tube and passes thence 1 through E into the calorimetric apparatus. Tf 



CAS 

 SUPPLY 



Fig. 6. 



the connecting tap, H, be open, so that the columns of mercury in the two limbs, G 

 and S, are connected, it is obvious that, as the steam pressure rises, the mercury will 

 be forced downwards in S and upwards in G, until eventually the main supply of 

 gas passing through the lower end of the tube, A, is more or less cut off. When the 

 gas supply to the burner is thus reduced, the rate at which steam is generated is 



