t 
: 
W. Hallock—Smee Battery and Galvanic Polarization. 273 
around the platinum did not contain a trace of ZnSO, It may 
be here remarked that had all the H,SO, around the zinc be- 
come ZnSO,, the consequent increase in the resistance of the 
cell, either in this case or that of the flask cell of § 3, it would 
ave made a scarcely perceptible difference in the intensity of 
the current measured. 
_ These results seem to throw us back upon the old explana- 
fon, which ascribes the variations in the electromotive force o 
the Smee battery, to the variations in the counteracting force 
of the hydrogen polarization of the platinum plate. 
5. DETERMINATION OF THE ELECTROMOTIVE FoRCE OF 
POLARIZATION. 
essary 
Tent is still closed.” I must admit, from my experience, that 
Plish, unless perhaps with an electrometer and switch as before 
mentioned. : 
An example will show how rapidly the polarization vanishes. 
The following is the falling off of the polarization of 
SO, between electrodes of gas-retort carbon. 
Time j 60 120 180 480 
Fores in Desiell, ion ith Lee bes as! fas 139, 198 a0 00 
The value for “0” sec, is that calculated by closed primary 
Current.§ 
nasmuch g. 
determinations the method by closed primary current seem 
decidedly preferable and was employed. 
‘ver, arise when this method is applied. 
x a eS F . 388, 1878. 
{ W. bee Wiel oak Se om aout es 429, May, 1880. 
C. Fromme, Sep. Abdr. a. d. 20, Ber. der Oberh. Gesellsch. f. Natur. u. Heilk., 
% Wied. Ann., xii, p, 399, 1881. . : 
§ The vanishing of polarization has also been studied by serge A tient Go. 
Bei others, whose results agree with mine; compare here 759, 1880.) Ogg- 
nn, xxix, p. 106, 1850) and A. Witkowski (Wied. Ann., xi, p. 759, 1880. 
Am. Jour. Sct.—Tutrp Serres, VoL. XXV, No. 148.—ApPRIL, 1883. 
19 
Tn the first place a 
