10 



HKNJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



piece of iron ; but if both branches of the fork be applied 

 to both poles of the magnet, the attractive power of the 

 lower end is neutralized or destroyed, for it no longer sus- 

 pends the piece of iron. Price, $0.50. 



The above seven pieces of apparatus, together with some 

 soft iron filings for sifting on paper, or glass discs, placed 

 over the poles of a magnet, to exhibit the beautiful and 

 systematic arrangement of the magnetic curves, form an 

 amusing and interesting apparatus, 



Price, of the whole, with two magnets, $6.00. 



Fig. 420. Magnetic Toys. 



(Figs. 419 and 

 420.) These con- 

 sist of swans, 

 ducks, fish, boats, 

 &c., and are a 

 source of pleasing amusement to 

 youth, from the various pheno- 

 mena presented by the action of 

 the different poles of the magnet, 

 in alternately attracting and re- 

 pelling the same object. They 

 are constructed to swim in a bowl or basin of water, where, 

 by the application of the magnet wand, they may be made 

 to perform a number of curious and pleasing evolutions. 

 Price, 25cts. to 50cts., and 75cts. each. 



