1004 



Voltaic Electricity. Section 7: Induction Currents. 



No. 62 923 - 



O-J-O 



62 923. 1 : 6. 



52 068. 1 : 6. 



62 924. 1 : 5. 



62926. 1:16. 



62.923. Two-phase Alternator, Figure, with driving stand. The machine can be used 

 instead of the double pachy trope for working Nos. 62,921 and 62,922 



The machine can be employed for taking off both single-phase and two-phase alternating current. 

 Two to three accumulators are used for exciting. Its mode of action is easily understandable as the 

 coils are of different colours. 



62.924. Commutator for Transforming Low Pressure D. C. into A. C., Figure, for the 

 Whirling Table 



52,068. Model for Demonstrating the Behaviour of a Short-circuited Rotor in the Rotary Magnetic 

 Field, Figure, after Friedr. C. G. Miiller (M. T., Fig. 222), for placing on the Whirling 

 Table; with a squirrelcage rotor which can be used both with and without an iron core 



62,926. Apparatus for Demonstrating Synchronism and Asynchronism, Figure, after Gotze 



A cord rotates (1) the 4-pole periphery, representing the rotating field; and (2) the innermost 

 disc provided with a thick point at the periphery (rotor as tunnel armature). The ring (stator) placed 

 between these has black strips on the outer periphery (slots). The rotor disc can be rotated at the 

 same speed or at a lower velocity by means of a stepped pulley, so that in the first place 

 synchronism is present and in the other case asynchronism (slip)- 



62,927. - - idem, smaller 



62,928. Aluminium Egg after Thomson 



The hollow bipartite egg, which can be used either filled with iron filings or without these, rotates 

 on its point in the rotating field. For making the experiment, use is made of one the Apparatus 

 Nog. 62,905/14 in the tiltable pattern by placing the ring horizontally on a glass plate and inserting 

 the egg in it. 



. s. d. 

 8. 0. 



0. 18. 



2. 10. 



10. 0. 



7. 0.0 



0. 6. 



Cl. 6054, 4684, 

 2719, 4013. 



