No. 62935. 



Alternating and Three-phase Current. 



1005 



62 933. 1 : 6. 



62 930 B, 62931. 1 : 10 and 1 : 2. 



62 932. 1 : 7. 



62 934. 1 : 6. 



62 935. 1 : 9. 



62.930. Apparatus after Behrend for Demonstrating the Flow of Current in Three-phase Con- s. d. 

 ductors, Figs. A and B (Ztschr. f. d. phys. u. chem. U. 5, p, 44) 0. 14. 



62.931. -- idem, transparent, for the Projection Lantern, Figures 1.10.0 



62.932. Apparatus after Moser, Figure, for showing the flow of current in three-phase leads 



By means of a gearing three glass tubes combined on a wood stand are rotated at the same 

 speed. These glass tubes, representing sections of the three-phase leads traversed by the current, are 

 provided with sheet iron strips. One side of all the latter is painted red and provided with an arrow, 

 the others being blue and having arrows pointing in the opposite direction. Since these Iron strips are 

 placed at angles of each 120 relative to each other, the apparatus gives, according to the different 

 positions of the observer, a clear image of the momentary current-density (apparent width of metal strips) 

 and of the current-direction (colour of the strip and direction of arrow) in the individual leads. 



62.933. Model of a Star Connection, with three glow-lamps, on marble, Figure . . . . 



62.934. Model of a Delta Connection, with three glow-lamps, on marble, Figure . . . 



62.935. Board for Explaining the Star and Delta Methods of connecting in Three-phase Plants, 



after Gb'tze, Figure 



2. 8.0 



1. 10. 

 1. 10. 



5. 10. 



Cl. 2732, 407, 6059, 



406, 2735, 6062, 3S89. 



