L379 
Temperature 
15.°5 30.0 40.°5 46.°5 49.°0 
A 1.25 1.13 1.04 0.95 0.90 
It should be observed here that the temperature prevailing at 
the cathode is higher than the temperature of the bath on account 
of the great intensity of the current. As however with higher tem- 
perature of the bath also the cathode temperature will be higher, 
the values given here are yet sufficient to prove that with higher 
temperature the scattering decreases. 
The heat-effeet mentioned here also causes the experiments carried 
out with constant temperature of the bath, to take place with dif- 
ferent cathode temperatures, when the density of the current is 
different. The higher the latter, the higher also the cathode tempe- 
rature. Hence strictly speaking the lines in figure 2 do not hold 
for constant temperature. 
5. Seattering in solutions of potassium and calcium salts. 
Just as in sodium salts lead easily scatters in solutions of potas- 
sium salts. The value of the power of scattering is somewhat larger 
for potassium salts for great current density than for sodium salts, 
somewhat smaller for low current density. 
The subjoined table gives the values of normal-solutions of 
HCO, KOR Sande KeSO, 7 == 15> 
Current density. 
0.16 0.64 2.56 
K,CO, 0.80 1.41 2.02 
K.SO, 0.85 1.38 912 
KOH 0.80 1.51 2.16 
In solutions of calcium salts the lead-scattering is very slight, in 
a normal solution of CaCl, A= 0.05 for D = 2.56. For mixtures 
of KCl and CaCl, we found for D= 2.56: 
100°/, KCL A=1.97 
; SO SKC AES AED 
ZOE AARD 
09/7 KCl eA — 0.05: 
On addition of a lead salt to a potassium salt the scattering power 
diminishes, as was to be expected. Yet with a current density 2.56 
scattering of the cathode still takes place even when the lead con- 
tent is considerable. 
The subjoined values hold for a solution of potassium acetate and 
89 
Proceedings Royal Acad. Amsterdam. Vol. XVIII. 
