A XKW (;ri;i;I.M \VKI;ilKI!. KTC. 



other i inch. Thin brass tubes, projecting outwards for A inch, are tilted into 

 thi-.se holes and hard soldered to the quadrants. To the larger of these tubes the 

 strands comprising the outer conductor of the concentric are soldered, and to the 

 smaller the inner strands are similarly joined. Each quadrant i drilled centrally 



FIXED LEFT 

 U2 LI L2 



FIXED RIGHT 

 LI U2 



Fit;. 25. Multiple commutator HIU! plug lioard. 



with a large tapering hole; by means of conical plugs connection with other circuits 

 for the measurement of insulation resistance, &c. can thus be made. The two 

 positions of this commutator are designated hereafter by the letters A and B. 



Multiple Commutator and Plug Jioattl (P, fig. 23 and fig. 25). This consists of 

 four commutators, constructed in n similar manner to that already described, and a 



Vol.. O VII. A. 3 X 



