between Plates for small Distances. 

 Table III. — Air, 15 cm. Pressure. 



155 



Distance in 



Potential in 



Distance in 



Potential in 



Wave-lengths. 



Volts. 



Wave-lengths. 



Volts. 



1-5 



85 



29-0 



320 



2-5 



106 



53-5 



360 



3-0 



122 



78-0 



400 



4-0 



156 



103-5 



412 



6 



200 



160-0 



468 



8-0 



300 



200-0 



512 



Table IY.— Air, Two 



Atmospheres 



Pressure. 



Distance in 



Potential in 



Distance in 



Potential in 



Wave-lengths. 



Volts. 



Wave-lengths. 



Volts. 



10 



96 



170 



460 



1-5 



130 



19-5 



508 



1-5 



142 



25-0 



564 



2-0 



200 



29-5 



684 



3-0 



302 



36-0 



720 



4-5 



312 



450 



840 



5-5 



324 



45-0 



912 



6-0 



356 



470 



880 



95 



376 



55-0 



1016 



140 



376 



' 





Table V. 



— Air, Three 



Atmospheres 



Pressure. 



Distance in 



Potential in 



Distance in 



Potential in 



Wave-lengths. 



Volts. 



Wave-lengths. 



Volts. 



10 



107 



15-0 



512 



2-0 



194 



170 



512 



2-5 



240 



190 



568 



2-5 



260 



24 5 



660 



30 



£04 



31-5 



768 



8-0 



368 



38-0 



886 



11-5 



£00 



42-0 



1024 



13-0 



480 







plates was controlled by a tangent-screw working through a 

 stuffing-box. 



Carbon Dioxide. 

 The only other gas experimented upon was C0 2 . The gas 

 was allowed to pass into the iron vessel described in the 

 previous paragraph, the air being removed by displacement. 

 The results obtained are given in Tables VI. and VII., and 

 represented graphically in fig. 5. Both curves are for C0 2 

 under atmospheric pressure, with this distinction : that in 

 the upper branch of the curve a gentle flow of C0 2 was 



