HISTORY AND PROGRESS. 



87 



the other end of the beam is depressed. The play 01 the 

 beam, which turns on the axis c, is limited by the adjusting 

 screws u and z. The style is carried on the end of a screw 

 which enables the operator to regulate its position in the 

 groove so as to indent the paper more or less legibly. 



Fig. 45. 



When the current passes through the coils of the electro- 

 magnets, the armatures are attracted to each other and the 

 style forced into the paper strip underneath the groove, 

 where it is held while the current lasts, and as the paper 

 during this time continues to be drawn through, a long or 

 short score is produced, according to the time which the 

 transmitting key is held down. 



61. The Morse Code. The elementary signs of the Morse 

 telegraph are two, a dot and a dash, produced by the record- 



