868 



Voltaic Electricity. Section 2: Current Conduction and Distribution. 



Nu. 61 143 



61143. 1:3. 



61 144. 1 : 3. 



61 146. 1 : 6. 



61 153 B. 1:5. 



61 156. 1 : 5. 



61.143. Key, Figure, for temporary or permanent closing of a circuit 



The key is mounted on ebonite and can be fixed to the table by two screws. 



61.144. Double Key (Successive Key), for the Wheatstone Bridge, Figure 



One circuit is closed first by pressing the knob, stronger pressure closing a second. 







61.145. -- idem, with galvanometer Back Key, specially for moving-coil galvanometers 



61.146. Discharge Key (Heim's), Figure, for capacity determination (E. T. Z. 11, 1890, 

 p. 556) 



61,147. Morse Key, Figure, with platinum contact, for weak currents 



Multiple Commutators, Figure (W. D., Fig. 486 [461]), arranged so that the cells or 

 accumulators to be connected up can be put in scries, in groups or in parallel, with 

 wood cylinder. 



List No. 61,148 61,149 61,150 61,151 



For 4 (I 8 1- cells 



Voltage available on connecting up) A 

 single accumulators . . . volts) -' 4 ' * 



2.0.0 



2.8.0 



3.4.0 



> t i\ * i-> > i 

 5.8.0 



Multiple Commutators with Stabilit Cylinder and Slate Insulation, for currents to 10 amperes. 

 Figs. A and B. 



No. 61,152 61,153 61,154 61,155 



For 



6 



1L> cells 



Voltage available on connect ing ,,,,| 12 



single accumulators .... volts j 



4. 16. 



6.0.0 



7.4.0 



s. d. 

 0. 10. 



1. 5.0 



1. 10.0 



L'. 10.0 

 0. 1(1.0 



9.0.0 



Cl. 4676. 4540. U 



'. .-,s(ii;, L'-.'tn, -.".'41. 



