FURNACE REACTIONS UNDER IIIOH GASEOUS PRESSURES. 451 



TABLE I. E.M.F. and Current of Carbon Arc under Pressure (see fig. 10). 



A. 



In air at atmospheric pressure. 



+ ve 41 millims. 



- ve 27 mi Him-. 



Length of arc 8 millims. * 



iuii|H-n-i TolU 



40 60] 



80 5 



118 46 i- silent. 



180 63 



250 66 



B. 



In rarln m monoxide. 



Both carbons 27 millims. 



Length of arc 1 to 2 millims. 



(1) At 12 atmospheres. 



ampere* roll* 



38 42 



60 32 



140 27 



(2) At about 90 atmospheres. 



30 140 



100 110 



150 115 



C. 



In nitrogen. 



Both carbons 27 millions. 

 Length of arc about 2 millims. 



(1) At 1 3 atmospheres. 



!IIII|H'TI'< TolU 



50 60 



55 58 



60 58 



65 50 



(2) About 20 atmospheres. 

 60 120' 



60 124 



D. 



In carbon monoxide. 



Both carbons 1 1 millims. 



Length of arc 1 to 2 millims. 



(1) At 11 atmospheres. 



70 

 75 

 80 

 80 



120 

 117 

 117 

 120 



iinipi-n-4 



12 

 13 

 15 

 25 



27 

 38 

 48 



TolU 



70 

 68 

 61 

 72 

 70 

 79 

 82 



abnormal 

 running. 



(2) At 16 atmospheres. 

 32 110 



36 108 



44 120 



60 128 



E. 



In air. 



+ ve carbon 4 1 millims. 



- ve carbon 27 millims. 



Length of arc about 2 millims. 



(1) Pressure, atmospheric. < 2 > A * 15 "^spheres. 



""uT T K^ """>"' 130* 



30 41\ 16 110 



50 37 r i88in - 17 

 80 40J 



20 

 40 



90 

 82 

 68 



(3) At 190 atmospheres. 

 mpre Toltt 



90 120' 



95 120 



100 108 f mnnin g- 



abnormal 



* In A only the length of the arc is the distance between the point of the negative of the edge of the 

 crater of the positive. In all other experiments it is the distance of feed required to produce actual 

 contact between the two electrodes. Solid carbons were used throughout. 



3 M 2 



