HISTORY AND PROGRESS. 



37 



example, the needles 1 and 4 are deflected, pointing to the 

 letter Y. The numerals and were telegraphed by the deflec- 

 tions, to the right or left, of single needles. 



One end of each of the multipliers was brought out on 

 the lower half of the right-hand side, and continued to one 



Fig. 18. 



of the five-line wires ; the other ends were joined together 

 and attached to the line used for a return circuit. 



The manipulator or key, Fig. 19, consisted of six metallic 

 springs 6, 1, 2, 3, 4, 5 each of which was provided with 

 two buttons with contacts working downwards upon two 

 parallel metal strips, p and N, to which the poles of a 

 voltaic battery were connected. With this arrangement, the 

 operator, by pressing down, at the same time, the buttons of 

 two springs, one over each of the strips p and N, could transmit 

 a current through one line and back through another, deflect- 



