No. 60245. 



Conductors. 



807 



60 240 A. 1:6. 



60 242. 1 : 5. 



60245. 1:9. 



60,239. Conductor with sharp point, on stand (Kleiber, Phys. f. Gymn., Fig. 272; Gan.-Man., . . d. 

 Fig. 626; Gan.-Eein., Fig. 755) 0.15.0 



60,240. Apparatus (Mach's), Figs. A and B, for demonstrating the variation of density of 

 electricity with the size of the conductor 



The apparatus consists of 4 brass caps telescoping one in the other on insulating stand, with 

 paper pendulums and with glass hooks for withdrawing. 



60,241. - - idem, double the size of preceding 



60.242. Faraday's Beaker, Figure, for showing that the electric charge of a body is pro- 

 portional to the quantity of electricity conducted into it (Fr. phys. Techn. II, 1, Fig. 100) 



The apparatus consists of a beaker of wire netting on insulating stand. The metal bottom of 

 the beaker possesses a hook for a connection with the electroscope; 6 balls of equal size serve for 

 conducting an increasing load to the beaker. 



60.243. Hollow Cylinder of Metal, for showing that free electricity is present on the surface, 

 Figure, on stand 



The cylinder carries 2 pairs of elder -pithballs; when charged the external balls only diverge. 



60.244. Brass Ball on Insulating Stand, with 2 surrounding hemispheres with glass handles, 

 as suggested by Coulomb, Figure (M. P. 9 th edn., Ill, Fig. 125; Gan.-Eein., Fig. 717), 

 for demonstrating that electricity resides on the surface 



60.245. Pfaundler's Apparatus for the same experiment, Figure (M. P. 10 th edn., IV, 1, 

 Fig. 127; 9 th edn., Ill, Fig. 127), consisting of a wire cage and insulated metal plate 

 with conducting and insulating lead to the electroscope. Price, without electroscope 



0. 18. 



2. 0.0 



0. 15. 



1. 0.0 



0. 18. 



1. 7.0 



CI. 2100, 2091, 2092, 

 2099. 2101, 2093. 



