Two Fluids, and of Two Metals not in Contact. 497 



No. 



27 

 28 

 29 

 30 

 31 

 32 

 33 



Fluids of the degrees of concen- 

 tration mentioned. 



Sulphuric acid {s) 

 Water {w) 

 Nitric acid (s) 

 Water {w) 



Hydrochloric acid (s) 

 Water (w) 

 Caustic potash {a) 

 Water (w) 

 Ammonia (a) 

 Water {w) 

 Sulphuric acid (s) 

 Iodide of potassium (i) 

 Hydrochloric acid (*•) 

 Iodide of potassium (i) 



Tin 

 Platina. 



s <io 

 s <cw 

 a = w 





Tin. 

 Silver. 



S <IV 



s <:.w 

 s>-i 



Tin. 

 Copper. 



S>' w 



s ■<w 



S '<W 



a < w 

 s > i 

 s>'i 







Amalg. 



Amalg. 



Amalg. 



Amalg. 



Amalg. 



Amalg. 



No. 



Fluids of the degrees of con- 



of 



of 



of 



of 



of 



of Zinc. 



centration mentioned. 



Zinc. 



Zinc. 



Zinc. 



Zinc. 



Zinc. 



distilled 







Platina. 



Silver. 



Copper. 



Tin. 



Iron. 



Zinc. 



34 



Sulphuric acid (s) 



s>z<? 



s -<?(; 



s <:iv 



S '<IV 



s>- w 



S < TW 





Water («;) 



s<:«j 









s> w 



s >-w; 



35 



Hydrochloric acid (s) 



s> w 



S '^W 



s <ty 



S>' IV 



S>' w 



s ^w 





Water (w) 



s< w 









s>w 



s:^w 



36 



Caustic potash (a) 



a >zo 



a > w 



a>'W 



a<w 



a:^w 



a '^w 





Water (lo) 













a>'W 



27. With silver and copper the s> w vireak, often s = lo. 



28. All Aveak, yet -vi'iih. platina 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 >- z as also the subsequent s < i weak. With 

 silver and copjjjer 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. — With platina only the first deflection of 10° 

 to 20° in the direction s > w, succeeded by one of 90° in the direction of 

 s < V). 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 the 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 < iv, rapidly decreasing and passing into s > ^t; to 20°. 



35. In this case with platina the reversion evident, but making its appear- 

 ance slowly ; after repeated immersions only s <: w;. — 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 <cw with tin pretty powerful ; both effects weak 

 with zinc, 



FMl, Mag, S. 3. Vol. 16. No. 105. Jm€ 1840, 2 L 



