No. 60369. 



Electrophorus. Electrical Machines. 



815 



60 363. 1 : 9. 



1 



60 364. 



60365 60369. 1:8 1:16. 



60.361. Electrophorus of Palmier! insulating material (W. D., p. 659 [600]), 26 cm, with metal s. d 

 base, double walled metal cover with ebonite handle and burled silk rubber .... 0. 12. 



60.362. Electrophorus of ebonite, Figure, 21 cm diameter, with metal cover and auxiliary 

 apparatus, both in box 0. 18. 



Auxiliary apparatus: 1 small Leyden jar, 1 chime of bells, 1 electric wheel, 1 set dancing balls, 

 3 elder pith figures, 1 discharger, 2 electric pendulums, 1 ebonite plate for Lichtenberg's dust figures, 

 1 set instructions. 



60.363. Tyndall's Electrophorus, Figure (Tyndall, Heat, Fig. 23) 4. 0. 



The cover of the electrophorus is suspended from a balance. When the Electrophorus is excited 

 and the cover placed on, a considerable weight is necessary to lift it off. The beam can be used both 

 as an ordinary balance and a hydrostatic balance when the electrophorus is detached. 



Frictional Electric Machines, Influence Machines and 



Auxiliary Apparatus. 



60.364. Bar Machine (Grimsehl's), Figure (Ztschr. f. d. phys. u. chem. U. 15, p. 284), 

 for demonstrating the mode of action of the frictional electricity machine, especially 



the electricity of the rubber - | 1. 8. 



Disc Machine, Figure (W. D., Fig. 446 [419]), with iron base and ebonite axis, solidly 

 constructed. 



List No. 60,365 60,366 60,367 60,368 60,369 



Diameter of Discs cm 36 42 50 60 70 



- 4. 0. 5. 0. 6. 10. 8. 0. 0. 10. 0. 



Cl. 2124, 



5615, 2125. 



