40 



Max Kohl. Chemnitz. 



8. Biihmkorff 

 Induction Coil giving 

 500 millimeter 

 sparks. (Fig. 8.) 

 The insulation in the 

 secondary coil consists 

 of a soft material which 

 obviates the risk of de- 

 struction during trans- 

 port. The length of the 

 secondary wire is about 

 75000 meters. The 

 apparatus is provided 

 with a Foucault contact 

 breaker and 2 spark 

 electrode stands fitted 

 with wire clamps for 

 spectroscopic experi- 

 ments. 



9. Electromagnet 

 for Diamagnetic and 



Paramagnetic 

 Experiments. (Fig. 9) 



Accessories : 



Suspension apparatus 

 for light paramagnetic 

 and diamagnetic bodies, 

 in glass .box. 



Apparatus for de- 

 monstrating the dia- 

 magnetism of flames. 



Apparatus for de- 

 monstrating the damp- 

 ing effect of induction. 



Polarimeter showing 

 the rotation of the po- 

 larization plane. 



Copper disc for Fou- 

 cault's currents. 



Apparatus for sepa- 

 rating aureole and 

 sparks. 



10. Miniature Steam Engine and Boiler encased in a nut shell. 



(Fig. 10.) 



The annexed figure is a full sized illustration of the engine. 

 The model has been made in the workshops of the firm and forms 



