990 



Dynamos. Explanatory Models. 



No. 62 756 



62 756 A. 1:11. 



62756B. 1:11. 



62757. 1:10. 



62758. 1:8. 



62 759. 1 : 4. 



62.756. 4 Mechanically Movable Plates for illustrating Dynamos and Motors, after ( . Kreyer, s. d. 

 Figures A and B 1.10.0 



The following demonstrations can be carried out with these plates: (1) Magneto -electric Machine 

 with double T armature (Alternating Current); (2) idem (Direct Current); (3) Dynamo with double T arma- 

 ture; (4) Dynamo with Gramme Ring; (5) Electric Motor (Direct Current) with double T armature; 

 (6) Electric Motor with Gramme Ring; (7) Alternating Current Machine; (8) Alternating Current .Motor 

 (three-phase motor). 



To Plate I (double plate), which is suitable for demonstrations Nos. 1 6, the following accessories , 

 are supplied: 1 folding disc for dynamo, 1 ditto for motor, 2 disc* for Gramme Ring, 1 coloured disc for 

 the magnetic field, 1 commutator in two parts, and 1 ditto in 8 parts, 2 brushes. 4 connerting loads. Plate 

 II is used for Demonstration No. 7, Plate III for Demonstration No. 8. 



62.757. Model Of a Gramme Ring, F i g u r (W. D. p. 883 [818]), of pasteboard, 50 cm dia- 

 meter, divided, the path of current and the poles are given 0.16.0 



In the illustration one half of the ring is turned round: the poles of -iiiiil.il name go together. 



62.758. Model of a Schuckert Flat Ring, with winding, Figure, with ring, commutator. 



and axis of wood 1. u. 



i-,7.~)!(. Model of a Siemens Armature, with winding, of wood. Figure 

 til'. 7<;o. Model of a Gramme Ring Armature, same construction .... 



1. o. 



1. 0.0 



'l. '2708, 2708a, '.'709. 

 2711, 3818. 



