FURNACE REACTIONS UNDER HIGH GASEOUS PRESSURES. 



441 



The experiment detailed in Table IV. was one of those in which all the gaseous 

 products of reaction were retained in the furnace until long after the completion 

 of the run. 



Fig. 12, which refers to this experiment, is reproduced, since it is typical of many 

 of those dealt with in the section. 



10 20 ^0 40 



TlHC IH HIMUTtS 



SO 60 



Fig. 12. Energy, power, and pressure curves of a calcium carbide experiment. 



The curves refer to the experiment dealt with in Table IV., in which the furnace was started at 

 atmospheric pressure and all the gas generated was retained. 



Curve A represents the power in kilowatts at each instant. 



Curve B is obtained by integration of A, and gives therefore the total energy expended up to 

 any given time. 



The readings of the pressure gauge on the furnace, taken at intervals, are marked on the 

 diagram, and fall nearly upon the energy curve. 



The power at each instant during the run is given in curve A, whilst the total 

 energy expended up to any given moment, obtained by an integration of this, is 

 given at B. 



In all the experiments the pressure after the first few minutes rose at an almost 

 constant rate. When the pressure oljservations are plotted to a suitable scale they 

 coincide with the integrated power curve. In the figure their position is indicated, 

 and the concordance can thus be clearly seen. 



The interpretation is not so simple as it appears, for there are two disturbing 



VOL. CCVIL A. 3 L, 



