No. 62 489. 



Sell-Induction. Damping Action of Induction. 



977 



62 482. 1 : 4. 



62 483. 1 : 4. 



62 484. 1 : 9. 



62 485. 1 : 4. 



62 486. 1 : 8. 



MAX KOHL, CHEMNITZ 



62 489. 1 : 4. 



62,485. Accessories for Dia- and Paramagnetic Experiments, Figure, consisting of: 2 pole d. 

 pieces with conical ends, 1 stand for suspending the dia- and paramagnetic bodies, a glass 

 tube for holding off air currents, and 3 small bars of antimony, bismuth and glass . 1. 0. 



62,486. Apparatus for showing the Damping Action of Induction, Figure 



A bar magnet is suspended in a glass box having levelling screws. On the bottom of the box four 

 copper plates of different thickness and a brass plate of the same size can be laid in such manner that the 

 distance from the magnet is always equal. The variation of damping is very striking. 



52,059. Apparatus for Arago's Magnetism of Rotation, Figure on p. 287 (W. D. Fig. 560 

 [533]), for the Whirling Table 



An adjustable glass plate with magnetic needle is arranged above a large rotating copper disc. On 

 rotating the disc the needle is deflected in the direction of rotation, it being itself finally set in rotation. 



:>L'.iKiO. Rotating Magnet with rotary Copper Disc placed above it, Figure, on p. 287, for 

 the Whirling Table 



When the magnet is rotated the copper disc rotates in the same direction and almost as quickly 

 as the magnet (as the armature in an asynchronous three-phase motor). 



62,489. Apparatus for Generating Eddy Currents in a Copper Disc rotating between the Poles 

 of an Electromagnet, Figure (cf. M. P. 9 th Edn. Ill, Fig. 691), with stand . . . 



52,061. --idem, for the Whirling Table, Figure on p. 288 



The copper disc is rotated at a moderate speed without allowing the current at first to pass into 

 .the electromagnet. As soon as the current is closed it is noticed that a considerably larger expenditure 

 o-*. force is necessary to rotate the disc rapidly. 



5. 0.0 



1. 4.0 



1. 0.0 



3. 0.0 



1. 8.0 



Regarding above, cf. also Accessories to 

 Electromagnets Nos. 62,28162,313. 



Cl. 2688, 2691, 6026, 2690, 

 2692, 2695. go 



