898 



Voltaic Electricity. Section 3: Electro-Magnetic Current Measurements. 



No. 61 490- 



61 490. 1 : 10. 



61 491 and 61 496. 1 : 6. 



61 493. 1 : 8. 



61 499. 1 : 6. 



-'ft' 



61 500. I : 9. 





61502 and 61499. 1:8, 



61.490. Rotating Mirror Box driven by a handle, Figure 



The mirrors of the box are of the best possible quality. If desired they can be supplied coated with 

 silver or platinum on front at a proportionately higher price. 



61.491. - - i d e m, driven by a 110 volt D. C. Motor, F i g u r e, with rheostat, but without 

 arrangement No. 61,496 shown in illustration 



61.492. The Motor c;in also be supplied for 24, 65, 150 and 220 volts I). ('. Extra price 



The working voltage should be given when ordering. 



61,49.''.. idem, driven by a synchronous A. (\ Motor. Figure 



When ordering, kindly state working voltage and frequency. 



61. 1!H. - idem, with clockwork drive. The speed can be regulated within wide limits 

 liv means of a centrifugal regulator 



61,49."i. Transformer t'n r transforming the A. C. to be investigated to the high voltage necessary; 

 for 100 120 volts primary and .">(> cycles 



When ordering, kindly quote voltage and frequency. 



i i. M 



s. d. 

 2. 10.0 



(i. 10. (I 

 (t. 10. 



7. <>. o 

 :.. in. o 



3MJ, 



