Two Fluids, and of Two Metals not in Contact. 
495 
difference of the electromotive forces on the con- 
tact OF TWO METALS WITH TWO FLUIDS. 
No. 
Fluids of the degrees of concen- 
tration mentioned. 
Zinc. 
Platina. 
Zinc. 
Silver. 
Zinc. 
Copper. 
Zinc. 
Tin. 
1 
Sulphuric acid (s) 
Water iw) 
s'a w 
saw 
saw 
saw 
saw 
2 
Nitric acid (s) 
Water (w) 
s>-w 
saw 
Is aw 
s = w 
3 
Hydrochloric acid (s) 
Water (w) 
saw 
saw 
saw 
saw 
4 
Solution of chlorine (c) 
Water {w) 
o w 
caw 
caw 
C=W 
5 
Solution of chlorine (c) 
Hydrochloric acid (w) 
c~a s 
c>- s 
os 
c as 
c :> s 
6 
Caustic potash (a) 
Water (w) 
a>^w 
a w 
a:a w 
a aw 
7 
Ammonia (a) 
Water (w) 
a~aw 
a w 
a aw 
a>w 
8 
Carbonate of soda (n) 
Water (w) 
naw 
naw 
naw 
naw 
9 
Sulphuric acid (s) 
Borax (b) 
s :> 6 
s~ah 
s 'ab 
s>-b 
10 
Sulphuric acid (s) 
Iodide of potassium (i) 
s ai 
s>~ i 
s>- i 
sai 
11 
Hydrochloric acid (s) 
Iodide of potassium (i) 
s ai 
i 
s>-i 
s ai 
12 
Sulphuric acid (s) 
Sal-ammoniac (1) 
sal 
sal 
s-al 
sal 
1. With platina s'::^ w merely weak^ already diminishing on the second im- 
mersion, and then saw stronger than with silver, copper, tin ; with tin 
saw increasing. 
2. Results differing w^ith silver, sometimes s =zw, sometimes s w, in 
most cases however decidedly saw. 
3. All action feeble ; with copper however pretty strong. 
4. With platina and copper very strong, somewhat weaker with silver. 
With tin an inclination to caw. 
5. With platina and copper very strong, with silver weaker, with tin only 
the first (strong) deflection c as, immediately succeeded by strong os. 
6. With silver a~aw strong, after which, though to a slighter extent, with 
tin the a aw. 
*J. Strongest effects with silver and copper. 
8. Action feeble, strongest with platina and copper. 
9. Action pretty strong, weakest with silver. 
10. With platina in two experiments, first s~ai very strong, which however 
rapidly decreased and changed into s ai quite as powerful. In all the fol- 
lowing experiments, although the platina was always previously heated, the 
first effect was s ai and generally very strong, sometimes moderate at the 
commencement, and on repeated immersion increasing. — With silver and cop- 
per action very strong, with tin likewise but opposite. 
11. With non-heated platina, sometimes, but very feeble, s > i, passing into 
s < i. But with heated platina immediately and very strong s a i. With sil- 
ver and copper s> i very strong, with tin s ai moderate. 
12. With copper the s 1 strong, still stronger sal with tin. With a cir- 
cuit of tin and copper likewise s >7# 
