988 



Dynamos. Explanatory Models. 



No. 62 738 



62738. 1:10. 



62.738. Magnet Stand and Movable Armature Coil, Figure, for explaining the dynamo- 

 electric induction in dynamos, after Gb'tze, with a wood rail, and an iron rail to serve as 

 track or core of the movable coil 



52,066. Apparatus for explaining the Magneto-electric and Dynamo-electric Principle, for the 

 Whirling Table, Figures A and B on p. 288 



The apparatus consists of: 1 Pacinotti Ring, 1 Magnet, 1 Electromagnet, 1 Brush Conductor. 



62.739. -- idem, without magnet, as effective model of a dynamo, for placing on the 

 Whirling Table 



62.741. Model of a Direct Current Dynamo; can also be used as a Direct Current Motor, 

 Figure, for explaining the machine and the most usual methods of connection and 

 adaptations ; with a ring armature and a drum armature which can be easily interchanged 



The Machine can be used either as a series or shunt dynamo; when connected in shunt it can also 

 be worked with separate excitation. In addition it works as a series or shunt motor and it is possible to 

 demonstrate with it the action of the shunt regulator. Given in are one ring armature and one drum arma- 

 ture, which can be easily interchanged. All windings are composed of as few turns as possible so as to 

 increase the comprehensiveness; the individual armature coils are wound alternately with two different 

 coloured wires to facilitate the explanation of the machine. The current obtained when driven by hand 

 can be shown by a galvanometer and a small glow lamp. Used as a motor the machine actuates the fly- 

 wheel together with the handle. If the machine is worked more rapidly by means of a driving frame its 

 output is correspondingly larger. 



62.742. Sliding Resistance, for use as Shunt Eegulator 



s. d. 



9. 0.0 



3. 0.0 



2. 5.0 



9. 0.0 



Apparatus after Grimsehl for explaining the Dynamo (Ztsohr. f. d. phys. u. diem. U. 6, 1893, 

 p. 240), comprising: 



62,743. Electromagnet with horizontal cores and iron frame (Fig. 1) 



62,744. Current Conductor for above, showing the presence of the electric current when 

 the lines of force intersect, for rectilinear motion (Fig.2) 



62.745. idem, for rotary motion (Fig. 3) , 



62.746. -- idem, rectangular form, without commutator (Fig. 4) 



62.747. - - i d e m, rectangular form, with commutator (Fig. 6) . , 



62.748. -- idem, with a number of wire turns (Fig. 7) . . . . , 



62.749. Siemens H-Armature (Fig. 8) , 



1. 0. o 



7. 0.0 



0. 10. 

 0. 8.0 

 0.11.0 

 0.15.0 

 0. 19. 

 0.19.0 



CI. 413fl 



