N 7 o. 63 431 



Thermo-electricity. 



1063 



63 428. 1 : 5. 



63 422. 1 : 5. 



63425. 1:11. 



63 441. 1 : 7. 



Noe's Thermopiles, Figure (M. P., 9 th Edn., Ill, Fig. 835), the e. m. f. of a cell is 

 approx. 0.06 volt, that of a pile of 25 cells, for example, equalling 1.5 volt: 



List No. 63,421 63,422 63,423 



Number of Cells 12 20 25 



0.15.0 1.4.0 1.10.0 



63.424. - - idem, larger model, with 25 cells 



These thermo-piles have the cells arranged star-shaped and are supplied without heating device. 

 They can be heated with any Bunsen Burner or spirit lamp. 



63.425. 2 Thermopiles after Noe, consisting of 20 cells each, with 2 spirit Bunsen burners, 



Thermopiles Nos. 63,421 63,434 are used for demonstrating the practical arrangement of thermo- 

 piles; they are not intended for the permanent charging of accumulators. They are capable of giving 

 for a short time quite appreciable outputs. 



63.440. Thermo-electric Cross after Peltier (M. P., 9 th Edn., Ill, Fig. 839), for showing the 

 generation of cold by the electric current 



63.441. Apparatus for Peltier's Experiment after Weinhold, Figure (W. D., Fig. 620 [565]) 



2. 5.0 



5.10.0 



1. 0.0 

 0.16.0 



Cl. 6554, 



3517,3104,5327. 



