1880.] Strained Material, Ley den Jars, and Voltameters. 433 



Charging with one Minotto's Cell, Distilled "Water, and Platinum 

 Spirals, thoroughly freed from Air and then saturated with Hy- 

 drogen. 



August, 1876. 



Time in 



Observed 



u' calculated from 



Difference 



minutes. 



current u. 



the formula. 



(u — u') . 



1-35 



196-0 



152-1 



43-9 



2 



170-5 



149-6 



20-9 



3 



155-8 



146-1 



9-7 



4 



148-0 



143-0 



5-0 



5 



142-5 



140-3 



2-2 



6 



138-5 



1379 



0-6 



7 



135-5 



135-8 



—0-3 



8 



1335 



134-0 



-0-5 



9 



132-2 



132-3 



—01 



10 



130-9 



130-9 







11 



129-6 



129-6 







12 



128-5 



128-5 







13 



1275 



127-5 







14 



126-6 



126-6 







15 



125-8 



125-8 







16 



1251 



1251 







17 



124-5 



124-5 







18 



120-0 



1240 







19 



123-5 



123-5 







20 



1231 



1231 







The equations, therefore, which we have obtained, as solutions of 

 the general differential equation, to represent the phenomena of charg- 

 ing our voltameter with one Minotto's cell, when the distilled water 

 and the platinum spirals were in different states as regards the gas 

 absorbed are : — 



I. Distilled water freed from gas, platinum spirals left for some 

 time in the vacuum above the water, but not heated — 



u'=9&S+ 79-436-<>'&K. 



II. Distilled water freed from gas, spirals made red hot in vacuo — 



%'=86-2 + 85-76-°-° 6245 '. 



III. Distilled water, and platinum spirals thoroughly aerated — 



% f =40-25 + 101-256-0-087^ 



IY. Distilled water, and platinum spirals thoroughly freed from 

 air, and then saturated with hydrogen — 



^=120-38-02 e - 01 2". 



