MAX KOHL A. G., CHEMNITZ, GERMANY. 



Notice No. 18. 



Experimental Resistances with Z Weft Contacts, 



as suggested by Dr. W. Briisch, Liibeck, constructed by Max Kohl, Ltd., Chemnitz. 



We have, at the instigation of Dr. W. Briisch of Liibeck, con- 

 structed the Experimental Resistances with 2 Switch Contacts, described 

 below. This type of resistance admits of a variety of adaptations, 

 being particularly suitable for taking from heavy current supplies 

 any large or small currents at low terminal voltage. 



Type A, Fig. 1, with 39 contacts Resistance, 36 ohms - 

 maximum permissible load, 5 to 30 Amps, according to the position 

 of the contact handles for taking currents of from 0.03 to 30 Amps, 

 and pressures of 0.3 to 110 Volts from the network. 



Type B, Fig. 1, with 39 contacts - - 48 ohms resistance - 

 max. permissible load 5 to 20 Amps, according to the position of 

 the switch handle - - for taking currents of 0.08 to 20 Amps, and 

 pressures of 0.8 to 220 Volts from the network. 



Type C, Fig. 2, with 21 contacts 24 ohms resistance - 

 max. permissible load 5 to 20 Amps, according to the position of 

 the switch handles -- for taking currents of from 0.08 to 20 Amps. 

 and pressures of 0.8 to 110 Volts from the network. 



The terminal designated "O" is connected up to the zero 

 end of the resistance, while that designated ///. is connected with Type A and B. Fig.T. 1 : 8. 



the other end of the same; terminal /. is connected up to Switch Contact /. and terminal //. to Switch Contact //. 

 The resistances can be used in three different manners. 

 Grouping No. I. As a Series Resistance, Fig. 3. 



This method of using the resistances can be recommended in the case 

 of apparatus where there is no interruption of the current, for taking heavy 

 currents where the terminal voltage at the apparatus is fairly high (e, g., for 

 working an arc lamp). Coarse regulation is obtained by Switch Contact 



No. /., while 

 finer steps can 

 be had by em- 

 ploying No. //. 

 In this connec- 

 tion, the fol- 

 lowing current- 

 strengths should 

 not be exceeded 

 in the case of 

 each type: - 



I. Grouping as 



a Series 

 Resistance. 



To the Apparatus 



Type C. Fig. 2. 1 : S. 



Fig. 3. 



M. 18e. (2. A.) 



Copyright strictly reserved. 



Cl. 3769, 



S770, 4719. 



