928 



Voltaic Electricity. Section 4: Ohm's, Kirchhoff's and Joule's Laws. 



No. 62034 



62 035. 1 : 5. 



62 036 62 039. 



62 040. 1 : r>. 



32,034. Telephone Bridge after Nippoldt, Figure, range from 0.01 to 100 and 0.1 to 1000 

 ohms, comprising measuring wire, 2 comparison resistances, 1 telephone; can also he 



used for measurements with galvanometers and by the Wiechert method 



62,035. Lightning Arrester Test Apparatus, comprising a Nippoldt Telephone Bridge No. 62.0.51. 

 an extra-current apparatus as generator of alternating currents, and dry cell, in wallnut 

 box, with leather case and carrying strap, Figure 



Ohmmeter for reading resistances direct, Figure, for connecting up to accumulators, 

 with magnetic shunt to render the readings independent of the working voltage. 



List No. 62,036 

 Pressure necessary. Volts 4 



( 0250 & 



Hang.-. Ohms | .>-_.-(,<, 



t 7. 10. 



62,037 



4 



0500 & 

 5001000 



7. 10. 



62,038 

 12 



02:100 



62,039 

 20 



05000 



1>500 5000 5000 10,000 



8.0.0 



8.5.0 



i2.oio. Induction Apparatus with current-interrupting tuning fork, alter rppcnhorn. 

 Figure, for resistance-determinations of electrolytes in conjunction with a bridge 

 mid a telephone 



5.10.0 



!l. 0. 



1. L5. it 



(1. 2515, 5908", 

 55 F, 5849. 



