I. BATTERIES. 309 



1291. Pour-cell Apparatus, with copper plates, for showing 

 the thermo-electric properties of liquids. George Gore, F.R.S. 



(See Philosophical Magazine, 1857.) 



1292. Twelve-cell Apparatus, with platinum-wire elec- 

 trodes, for examining the thermo-electric properties of liquids. 



George Gore, F.R.S. 



(Sec Proceedings of the Royal Society, 1871.) 



1293. Model of the most improved form of apparatus for 

 investigating the thermo-electric properties of liquids. Used with 

 ribbons of platinum, gold, palladium, and silver. 



George Gore, F.R.S. 



1297. Thermo-Battery. Siemens and Halske, Berlin. 



1297a. Thermo- Electric Pile, small student's form, nickel- 

 plated. Harvey, Reynolds, and Co. 



1298. Thermo-Electric Pile (Noe's system), with 64 ele- 

 ments, heated by gas. The electro-motive power equal to six 

 Bunsen elements. P. Dorffel, Berlin. 



The elements, consisting of a round rod (positive) and thin wires (nega- 

 tive), are arranged in two opposite rows of 64 elements each, whose heating 

 bars (cast of positive metal and protected against the flame by copper casing) 

 project in a row into the open space between the elements, so that they are 

 all alike heated by the stand of Bunseu burners below, and convey the currents^ 

 to the elements. The cooling of the other junctions is effected by means of 

 metallic cooling-plates attached to them, supported by the wooden frame 

 under the elements. The electro-motive force is equal to 6 Bunsen or 120 

 Jacobi-Siemens' units. The resistance = 2 45 Siemens' units. The pile 

 contains a Dove's Pachytrope, in order to arrange the elements in groups of 

 1, 2, or 4, by means of which the resistances and the electro-motive force may 

 be changed. 



1299. Thermo-pile (Noe's system), with 20 elements in 

 radiating arrangement, heated by gas. The electro-motive power 

 is equal to one Bunsen element. P. Dorjfel, Berlin. 



Here the elements are arranged radially, so that the heating bars all 

 run to a middle point, where they can be heated by the single flame of a 

 Bunsen burner. The cooling is done with metal plates which are rolled into 

 a tubular form, and serve at the same time as stands for the battery. The 

 electro-motive force is equal to 1 Bunsen or 20 Jacobi-Siemens units. This 

 apparatus (as also the next, 1300) is recommended for small experiments in 

 electrolysis, &c. 



1300. Thermo-electric Pile (Noe's system), heated by a 

 spirit lamp, with 20 smaller elements, and consequently of greater 

 resistance. The electro-motive power is equal to one Bunsen 

 element. Resistance equal to 0'52 Siemens' units. 



P. Dorffel, Berlin. 



