370 DR. MEYER WILDERMAN ON THE CHEMICAL STATICS AND DYNAMICS OF 
The electric conductivities show that the concentrations used were from the 
decinormal to about centinormal. 
Experiments of July 31 (6 Curves taken ): 
(a) A decinormal NaBr solution was used. The resistance of the solution = 50 ohms 
(distance between the plates a little increased), the E.M.F. in the dark = 3 millims. 
to the left. Two curves were taken (N7 galvanometer shaken, had to lower screen of 
chronograph), N8 gave 120 millims. deflection = 12/ 5 x 10 ampeie 11 -j / x 10 
volt, the deduction allowed to become complete to within 2 millims. 
(/>) The solution from quartz vessel was removed and a normal NaBr solution 
added. The resistance was about 5 ohms. The E.M.F. in the dark =14 centims. 
to the left, N9 gave 105 millims., N10 gave 106 millims. deflection, average 
105-5 millims. = 112 x 10~ 9 ampere = 94 x 10~ b volt, 
(c) Removed the greater part of the solution, added water. The resistance 
found = 163-4 ohms. The E.M.F. in the dark = 7 centims. to the right. Curves 
Nil gave 92 millims., Nl2 gave 99 millims. deflection, average 95’5 millims. 
= 101 "5 x 10~ 9 ampere = 101 "2 x 10 -6 volt. The concentrations of July 31 were 
therefore between about normal and 0"025 normal NaBr solution. We thus get . 
In (a') in N8 : E 
In (?/) in N9 : 
in NlO : 
In (o') in Nil : 
in N12 : 
cxw = (834-4+ 50) 120 = 106-1 x 10 3 = 112-7 x 10 -6 volt. 
= (834'4+ 5) 105 = 88-14 x 10 3 = 93-6 x 1 0 -6 volt. 
= (834-4+ 5) 106 = 88-97 x 10 3 = 94-5 x 10~ 6 volt. 
= (834-4 + 163-4) 92 = 9F8 x 10 3 = 97-5 x 10~ 6 volt. 
= (834-4+163-4) 99 = 98‘78 x 10 3 = 104-9 x 10 -6 volt. 
Average of N8, 9, 10, 11, 12 
= 100-6 x 10 -6 volt. 
Average of more reliable obser. N8, 9, 11 : 101"3 x 10 6 volt. 
The above observations were extended for another day. 
On August 1 .— The solution of (c f ) was left in the dark short-circuited for about 
18 hours. The resistance was found to be 142*9 ohms (the two plates became a little 
nearer). The E.M.F. in the dark = F0 centim. to the left. On the drum of the 
chronograph a millimetre scale was placed and the deflection read. Distance, 
intensity of the acetylene, &c., &c., the same as on the previous day. The deflections 
obtained were 105 millims., 104*5 millims., 106 millims. = average 105-2 millims. 
= 111/7 x 10~ 9 ampere = 109T x 10 -6 volt, the deduction periods having been allowed 
to become complete. From this it follows :— 
N13 (c"): E = cxw = (834*4+142-9) 105 = 102-6 x 10 3 = 109 x 10 -6 volt, 
= (834-4+ 142-9) 104-5 = 102-1 x 10 3 = 108-4 x 10 -6 volt, 
= (834-4+142-9) 106 = 103’6 x 10 3 = 110 xl0“ 6 volt. 
Average = 109 x 10 " volt. 
