172 THE ELECTRIC TELEGRAPH. 



has been described. But this is scarcely necessary, as it can 

 be worked easily through, an overland line of from 500 to 

 750 miles. It is found to give marvellously good results on 

 the line between Hamburg and Berlin 370 miles even 

 when an artificial resistance, equivalent to 1,000 miles, is 

 added to the circuit. 



By the employment, however, of two batteries and a corn- 

 mutating arrangement, translation would be easy. 



The direct working polarised ink-recorder, constructed ex- 

 pressly for this system by Messrs. Siemens and Halske, is 

 furnished with electro-magnets of somewhat larger dimen- 

 sions, and contains a greater length of insulated wire than 

 is necessary in ordinary circuits. 



98. Stoehrer's Double-style Apparatus. Stoehrer sought to 

 remedy the inconveniences arising from the multiplicity of 

 signals required in forming letters when only two elementary 

 signals the dot and dash, as in Morse's system are em- 

 ployed, by the employment of two electro-magnets, with 

 separate printing-beams acting upon the same strip of 

 paper. 



This method puts four elementary signals, instead of two, 

 at his disposal for the construction of an alphabet ; and thus 

 places his method, in point of speed of working, on a level 

 with the needle-apparatus of Wheatstone. 



The two beams of the Morse are not moved by the currents 

 of two batteries, but by that of a single local battery directed 

 to the one or other electro-magnet by a delicate relay which 

 differs in its construction from those generally used ; the 

 armatures being formed by two light permanent magnets 

 whose opposite poles are alternately attracted or repelled 

 according to the direction of the current in the coils. It is 

 of necessity very delicate in its action in changing the local 

 current from one to the other electro-magnet of the recording 

 instrument. 



The recording apparatus consists of a Morse with two 

 electro-magnets and printing-beams. The styles at the ends 

 of the beams press upon the paper strip in the same trans- 

 verse line, about a quarter of an inch apart, underneath a 



