1008 



Voltaic Electricity. Section 7: Induction Currents. 



No. 62973 



62 978 A, 62981. 1:7. 



62.973. Three-phase Transformer (Core Transformer), Figure, with star connections; 

 ratio 1 : 10; for primary pressure of 80 -125 volts, secondary giving 8 12 volts; output 

 about 150 watts 



62.974. - - idem, for connecting to pressures of 20 40 volts, suiting Machines Nos. 62,775/6a 



62.975. -- idem, for connecting to pressures of 6 12 volts, suiting Machines Nos. 62774 

 and 62,787/9 



62.976. Alternating Current Transformer (Shell Type), Figure; ratio 5:1, for connecting 

 to 24 44 volts primary pressure, for transforming the current of Machines Nos. 62, 775/6 a 

 to five times the voltage 



62.977. idem, for pressures of 7 14 volts, suiting Machines Nos. 62,774, 62,787/9 . 



Inductive Repulsion. 



62,978. Apparatus after Elihu Thomson, with complete Accessories, F i g s. A H, for proving 

 the repelling action of a Magnetic Field, generated by A. C.. on good conducting metal 

 masses (Elektrotechn. Ztschr. 1890, pp. 387, 399 and 435) 



The following pertain to the complete apparatus and are supplied with it: 1 magnetizing Coil, 

 renting on three pillars, with stage and apparatus holder, with sliding core formed of a bundle of thin 

 iron wire; 1 Iron Membrane with tube (fastened to the apparatus itself in Fig. A) attached; 1 Balance 

 with copper disc. Fig. B; 1 Grip with Fork for fixing one copper disc and one iron disc having copper 

 rim, both painted with coloured sectors, Figs. C and D; 1 Iron Prism for tin- iron disc having copper 

 rim, Fig. D; 1 Copper Hollow Sphere with wood ring and watch-glass as support, Fig. E; 1 Coil of 

 coloured Aluminium Wire with cork and glow-lamp, also 1 Glass Vessel for carrying out I he experiment 

 under water, Fig. F; 1 Copper, 1 Iron, and 1 Glass Disc; 1 Wood Frame with a copper ring suspended 

 on fibres; Fig. G; 1 Copper Hollow Ring with attachment tube; 1 Copper Ring with pendulum suspension, 

 Fig. H; 1 Wide Copper Ring; 1 Wide Aluminium Ring; 1 Mercury Gutter. 



For making the experiments with this apparatus an alternating current (110 120 volts) supplied 

 direct from a power station, is suitable, of which 12 16 amperes are used for working the apparatus; 

 when using D. C. this must be converted into a pulsating current by means of the \\elmelt Inter- 

 rupter (No. 62,666, see below). 



Cl. 2780, 5379, 

 2820. 



. s. d. 



4. 10. 

 4. 10. 



4. 10. 



2. 10. 

 2. 10. 



7. 10. 



