MORSE S TELEGRAPH. 



E, its point of platinum. 



s. An adjusting screw to limit the play of E from the 

 magnet. 



T. Its insulating point, in ivory. 



o isr. Screws to 

 connect with the 

 wires of the station 

 battery. Fig. 84. 



p Q. Screws to 

 connect with the line 

 wires. 



x. The point where 

 the coil wire passes 

 through 



u, the base of the 

 magnet. 



The form recom- 

 mended for the key 

 commutator is re- 

 presented in its 

 proper magnitude in 

 fig. 85 (p. 46). When 

 the key is held down 

 the circuit is per- 

 fect. It is not liable 

 to wear and to pro- 

 duce a doubtful 

 connection. The ' 

 whole arrangement 

 is designed to avoid 

 the evils heretofore 

 existing, and perfect 

 every questionable 

 part. The anvil of 

 the key is well 

 made, firm, and 

 capable of hard 

 wear, regardless of 

 the adjustment of 

 the key lever. The 

 hammer of the key lever is also firm, and made of good platina 

 wire, and securely made fast in the key lever. The adjusting screws 

 of the axle are arranged according to the best mode, to secure the 

 most perfect action. The elevation of the key lever can be adjusted 

 to suit the operator, by elevating the key frame, or otherwise. 



45 



