Xo (!1 142. 



Terminals. Switches. Reversing Switches. 



867 



61 126. 1 : G 



61 134. 1 : 4. 



61 135. 1 : 4. 



61 136. 1 : 0. 



61 137. 1 : 4. 



61 139. 1 : 5. 



61 138. 1 : 3. 



61 140. I : 6. 



61 141. 1 : 6. 



61 142. 1 : 4. 



61.136. Commutator (Hermann's), Figure (W. D., Fig. 490 [465]), very neat type . 



61.137. Commutator (Berlin's), Figure, easily understandable and very neat (Gan.-Man., 

 Fig. 741) ! 



61.138. Mercury Switch (Pohl's), Figure, can be used both as a commutator and a 

 reversing switch (M. P., 10 th edn., IV, 1, Fig. 339 b; 9 th edn., Ill, Fig. 337) .... 



61.139. Plug Commutator, Figure, on ebonite slab and with screw clamp 



61.140. Commutator (Haiti's), for Heavy Currents 



The apparatus is mounted on a stand on round slate base; the connections made can be easily follow- 

 ed by the audience. 



61,111. Press Contact on wood board, with terminals, Figure (M. P., 10 lh edn.,IV, l,Fig. 334) j 0. 5. 



61,142. Key with Mercury Contact (Kolbc's), Figure (Kolbe-Skellon, Introduction to 

 Klcctricity, Part II, Fig. 102) 



s. d. 

 1. 0. 



1. 4. 



1. 4. 

 1. 2. 

 3. 0. 



Cl. 5807, 5830, 5816, 5829, 2258, 

 2259, 2261, 5809, 4549. 



0. 6. 



2260, 

 55* 



