No. 6-2370. 



Magnetos. Theory o! Lines of Force. 



963 



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62 370. 1 : 8. 



i;.!,:3t)<). Apparatus for demonstrating the Lines of Force of Current Conductors, sifter Bauern- 

 berger, Figure 



iL'..'>70. 1 Set Apparatus for explaining the Lines of Force Theory, after Berghoff, Figs. A 8 



For producing the magnetic fields use is made firstly of needle-shaped magnets and secondly of 

 copper wires, traversed by tin- current, and bent to correspond. The former are enclosed between two 

 glass plates size 130 x 180 mm: in the latter case a glass plate of the. same size is mounted in a wood frame 

 and drilled out to correspond with the shape of wire; the wood frame also carries the terminals for connecting 



ui) ''"' current. 



Constructed in this manner the apparatus are durable and can be easily cleaned. By strewing iron 

 filings on the glass plates the lines of force can be demonstrated visibly. We recommend for use in these 

 experiments ordinary iron filings carefully strained to different sizes; it is less advantageous to use ferrum 

 alcoholisatum. 



The following pertain to the complete set: (1)1 bar magnet, Fig. A; (2) 2 magnets, the opposite 

 poles being opposite each other, Fig. B; (3) 2 magnets whose similar poles are opposite each other, Fig. C; 

 (4) horse-shoe magnet, Fig. D; (5) 2 parallel magnets whose poles of similar name are alongside each 

 other, Fig. E; (6) 2 parallel magnets whose dissimilar poles are alongside each other, Fig. F; (7) deformation 

 of lines of force. Fig. G and II; (8) homogeneous field, Fig. J and K; (9) magnetic field of a current, 

 Fig. Ij and M; (10) magnetic field of a current perpendicular to direction of current. Fig. N; (11) magnetic 

 field of two parallel currents flowing in opposite directions. Fig. 0; (12) magnetic, field of two parallel 

 currents flowing in same direction, Fig. P ; ( 13) magnetic field of a number of circuits in series (of a solenoid), 

 Fig. Q; (14) solenoid with a number of windings, Fig. R: (15) earth's magnetic field, Fig. 8. 



For objective demonstration it is necessary to use an Apparatus for horizontal pro- 

 jection (List Nos. 51,032 to 51,039) or a Megadiascope. 



s. d. 

 0. 18. 



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Cl. 372-38T. 



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