Two Fluids, and of Two Metals not in Contact. 497 
No. 
Fluids of the degrees of concen- 
tration mentioned. 
Tin. 
Platina. 
Tin. 
Silver. 
Tin. 
Copper. 
27 
Sulphuric acid (s) 
Water (w) 
sew 
s >► w 
s:e w 
28 
Nitric acid (s) 
Water (w) 
sew 
sew 
sew 
29 
Hydrochloric acid (s) 
Water (w) 
sew 
sew 
sew 
30 
Caustic potash (a) 
Water (w) 
a = w 
a~>-w 
a>w 
a>w 
31 
Ammonia (a) 
Water (w) 
a ew 
aew 
aew 
32 
Sulphuric acid (s) 
Iodide of potassium (i) 
s>-i 
s>i 
s>^i 
33 
Hydrochloric acid (s) 
Iodide of potassium (i) 
s~z^i 
s ei 
s>i 
s~z^i 
No. 
Fluids of the degrees of con- 
centration mentioned. 
Amalg. 
of 
Zinc. 
Platina. 
Amalg. 
of 
Zinc. 
Silver. 
Amalg. 
of 
Zinc. 
Copper. 
Amalg. 
of 
Zinc. 
Tin. 
Amalg. 
of 
Zinc. 
Iron. 
Amalg. 
of Zinc, 
distilled 
Zinc. 
34 
Sulphuric acid {s) 
s>^w 
sew 
sew 
s e IV 
s>- w 
sew 
Water (w) 
sew 
S>- 2V 
S>W 
35 
Hydrochloric acid (6f) 
s > w 
sew 
sew 
S>^ IV 
s >- w 
sew 
Water iw) 
sew 
s~z^w 
S>W 
36 
Caustic potash (a) 
a':z^w 
a > w 
a>-w 
aew 
a>w 
aew 
Water (w) 
a~z^w 
27. With silver and copper the s'>- w weak, often s — w, 
28. All weak, yet yji^plaiina the first deflection = 20°. 
29. Actions weak, the least so with copper. 
30. With silver and copper stronger than With, platina. 
31. With silver and platina weak, with copper pretty strong. 
32. Silver and copper strong, platina very feeble. 
33. With platina both the s i sls also the subsequent s < 2 weak. With 
silver and copper the s > i very strong. 
34. In all the experiments with amalgamated zinc plates these were con- 
stantly kept in the fluids, and the negative plates only were taken out and 
immersed both at the same time. — MSf'Mi platina only the first deflection of 10° 
to 20° in the direction s>- w, succeeded by one of 90° in the direction of 
s ^w. The effect far more energetic than with silver, copper, tin, and than 
with distilled, not amalgamated, zinc in similar experiments (although here 
as well as in No. 1 platina had been heated to redness). — With iron im- 
mediately a very slow deflection of 20° to 30°, then a tranquil increase of the 
deflection to a permanent value of 40° and above. — With zinc immediately 70° 
in the direction s ^w, rapidly decreasing and passing into s > to 20°, 
35. In this case with platina the reversion evident, but making its appear- 
ance slowly ; after repeated immersions only s < iv. — Tin forming an excep- 
tion from No. 3, 20, 29. — With iron no increasing effect as in No. 34, but 
giving a stronger one than there. — Zinc as in No. 34. 
36. With platina weak, with copper somewhat stronger, but very strong 
with silver and iron. The a c:w with tin pretty powerful ; both effects weak 
with zinc. 
Fliih Mag, S. 3, VoL 16, No. 105, June 1840, 2 L 
