No. lit) 085. 



Molecular Theory, Lines of Force Theory. 



789 



60084. 1:21. 



60 076. 1 : 6. 



u 



60 078. 1 : 8. 



60 079. 1 : 8. 



60 085. 1 : 6. 



60.078. Horse Shoe Magnet, of sheet steel, Figure, for demonstrating an approximately 

 homogeneous field (Grimsehl, p. 648) 



60.079. 2 Small Magnets, 1 horseshoe and 1 bar magnet, Figure, cemented to glass 

 slabs, for objectively demonstrating the magnetic lines of force 



Apparatus for explaining the theory of the lines of force (Berghoff's), see Electricity Section. 



60.080. Glass Tube, half filled with iron filings, and with closed ends, for explaining the exci- 

 tation of magnetism 



60.081. Iron Filings, strained per 250 g 



60.082. Iron Powder (Limatura Ferri alcoholisata) '. per 250 g 



60.083. Sifter for above 



60.084. Soft Iron Rod for magnetic experiments, Figure (Friedr. C. G. Miiller's), 1.5 m 

 long, 2 cm thick (M. T., p. 218) 



60.085. Apparatus for explaining declination and inclination, as suggested by Prof. Zahl- 

 bruckner, Figure (Fr. phys. Techn. II, 1, Fig. 566) 



The tripod with pillar carries a short arm, on which is fastened a globe and a rotary meridian 

 arc. Inside the globe is a straight vertical electro-magnet, whose field corresponds to that of terrestrial 

 magnetism. The conducting wires for the magnetising coil pass through the hollow axis and end in 

 two terminals fitted to the stand. A slider is fixed to the arc of meridian with a magnetic needle, 

 which serves as the inclinator and declinator. By adjusting the slider and turning the arc of meridian 

 the needle can be turned in any vertical or horizontal plane. The globe is therefore fixed on the 

 horizontal arm and the inclinator can consequently be brought to the lower magnet pole, which corre- 

 sponds to the South pole of the earth. 



With the exception of the core of the electro-magnet and the magnetic needle the entire appa- 

 ratus is free from iron. 



s. d. 

 0. 15.0 



0. 5.0 



0. 1.6 



0. 1.0 



0. 1.9 



0. 1.6 



0. 5.0 



8. 0.0 



Cl. 4178, 4177, 4176, 4192, 



414-1. 

 5580, 5586, 5587, 2030. 



