No. 6'.' 412. 



Interaction of Currents. 



969 



62407. 



62.408. Roget's Spiral for the Attraction of rectified parallel Currents, Figure 



02.409. Apparatus after Garthe, Figure, for the action of crossed currents (M. P. 9 lh Edn. Ill, 

 Fig. 712) 



02.410. Electro-dynamic Double Pendulum, after Kolhe, Figure, for showing the mutual 

 attraction and repulsion of conductors and magnets (Ztschr. f. d. phys. u. chem. U. 23, 

 1910, p. 201) 



This newly-designed apparatus is very certain in its action and requires a current of only -2 3 amps. 

 at li 8 volts. A special advantage of the apparatus rests in the fact that one of the solenoids can be turned 

 through 180" so that the current flows in an inverse direction in relation to the other solenoid or the magnet, 

 without a commutator being necessary. 



62.411. Barlow's Wheel, Figure (M. P. 9 th Edn. III. Fig. 577; Gan.-Eein. Fig. 886) . 



62.412. - - idem, different pattern, Figure (M. P. 9 lh Edn., Figs. 574 576), with a 

 massive horse-shoe magnet which is set into motion 



Cl. 4161, 2802, 

 2801, 2862, 



S. d. 



0. 16. 



1. 4.0 



6. 0. 



1. 0. 



1. 10. 



2803, 6020, 

 2661. 



