at Low Pressures through the Passage of Electricity. 175 



D = the distance in cms. between the parallel plates ; 

 p = t\\Q mean pressure in nuns, of mercury during the 

 experiment ; 

 A/) = the fall of pressure in nuns. ; 



= the steady current in milliamperes ; 

 AQ = the quantity of electricity in coulombs passed through 

 the hydrogen and oxygen ; 

 X = the difference of potential in volts between the 

 parallel plates during the passage of the current. 

 The capacity of the part of the apparatus where the fall of 

 pressure took [dace was 1130 c.c. approximately. 



Table I. J) = '25 cm. 



p- 



Ap. 



C. 



AQ. 



Ap 

 aQ" 



X. 



X 



p.B' 



Ap 



pTaqTd' 



•74 



93 



275 



3-8 



1-6 



1-73 



392 



169 



90 



2-26 



8-6 



1-29 



1-75 



397 



176 



•78 



69 



2-2 



3-8 



1-37 



1-61 



392 



229 



•94 



3-27 



•51 



25 



•303 



1-68 



386 



472 



206 



2-76 



51 



4-95 



•302 



1-69 



397 



576 



2-45 



Table II. D = «5 



cm. 



8-8 



1-62 



35 



7-1 



1-71 



3-6 



5-6 



1-29 



3-6 



3-8 



■55 



2-5 



3-37 



•424 



8-2 



3-0 



<'.7 



8-1 



267 



•27 



39 



2-16 



•72 



164 



•85 



•86 



•645 



•31 



•247 



•4 



•157 



•43 



1-91 



20 



2-0 



1-8 



1-71 



1-67 



1-72 



1-69 



405 

 402 

 402 

 386 

 416 

 406 

 383 

 408 



Table III. D = l 



cm. 



93 

 113 

 144 



202 

 246 



276 



286 

 378 



•44 



•56 



•72 



•94 



1-02 



1-12 



128 



1-56 



_ . 



4-54 



•92 



47 



•42 



22 



415 



91 



•48 



4-48 



•525 



8-0 



•24 



217 



435 



97 



•485 



3-56 



•59 



5-0 



•3 



1-97 



412 



116 



•55 



2-85 



•62 



81 



•326 



1-9 



425 



149 



•67 



232 



•38 



3-9 



•232 



1-64 



393 



169 



•71 



o 23 



•56 



8-1 



•325 



1-73 



403 



181 



•78 



1-67 



•25 



15-3 



•14 



1-77 



426 



256 



106 



1-18 



178 



76 



11 



1-62 



426 



362 



1-37 







Table IV. 



D=15 cm. 







392 



•565 



80 



•24 



236 



435 



75 



•4 



345 



•484 



73 



•218 



222 



430 



83 



•420 



3-03 



•432 



5-0 



•2 



2 16 



413 



90 



•47 



2-11 



•87 



8-1 



•485 



1-8 



429 



135 



•57 



1-44 



•345 



8-1 



•19 



18 



415 



192 



•83 



143 



•231 



139 



134 



1-72 



448 



209 



•8 



