326 



Mr. G. Gore on the Thermo-electric 



[Feb. 23, 



As soon as the galvanometer-needles have settled at zero, one of the dishes 

 is quickly filled with boiling water, and the directions and amounts of the 

 temporary and permanent deflections noted. 



The following are Tables of results obtained with various liquids, the 

 solutions being diluted in each case to a specified measure by addition of 

 distilled water. Those of the experiments in which 20 ounces of liquid 

 was used, were nearly all of them made with an apparatus in which the 

 connecting-tube C was of somewhat less diameter ; and the deflections 

 obtained by that apparatus were less in extent than those obtained with 

 the " new apparatus," because in the latter the conduction-resistance was 

 somewhat less. The values of the deflections given in the Tables are in 

 all cases those of the temporary ones ; and the liquid used for diluting the 

 solutions was in all cases water. 



Pure Nitric Acid. 



Ounces of strong acid 

 diluted to 20 ozs. with water. 

 i 



TT 

 1 

 8 



* 

 1 

 2 

 1 



2 

 3 

 4 



Value of 

 Deflection 

 •0045 

 •0012 

 •0039 

 ■0497 

 •1177 

 •0356 

 •0578 

 •4954 



The hot plate was nega- 

 tive and much acted upon, 

 especially with the stronger 

 mixtures. With the stronger 

 mixtures a little gas was 

 evolved at 60° Fahr., and a 

 large amount directly the 

 heat was applied. 



Pure Hydrochloric Acid. 



Ounces of strong acid 

 diluted to 20 ozs. 



Value of 

 Deflection. 

 •0064^ The hot plate was posi- 

 •0330 I tive. The amount of stain 

 •1112 [ upon the hot plate was very 

 •2854 C small, and was in the form 

 •5731 of a dark line at the edge of 



2-0446 J the liquid. 



Chloric Acid. 



No. 

 L 

 2. 

 3. 

 4. 

 5. 

 6. 



Ounces of strong acid 

 diluted to 20 ozs. 



tV 



i 



Value of 

 Deflection. 

 •0002 

 •0016 

 •0040 

 •0287 

 •1234 

 •2005 J 



The hot plate was nega- 

 tive, and was but little acted 

 upon. With the strongest 

 mixture, the liquid in con- 

 tact with the hot plate soon 

 became green. 



No. 

 1. 



2. 



Weak acid 

 diluted to 10 ozs. 

 ... i 

 ... 1 



Hydrobromic Acid. 



Value of 

 Deflection. 



•0149 

 •0647 



Hot plate negative. Both 

 plates much stained, the cold 

 one the most so. 



