10 



F. N. GISBORNE ON 



Hitherto the speed of automatic transmission over long distance circuits has been 

 limited by static induction in the line wire, causing dots and dashes to run into each 

 other, and thus appear at the terminal station in a continuous line ; but such diiiiculty 

 has also been OA'^ercome. 



Multiplex telegraphy, on the other hand, requires practically perfect synchronism 

 between the instruments at both ends of the line, the elimination of static induction, and 

 as many electrical impulses per second as will render it impossible for a skilled Morse 

 operator to close his key without intercepting a current in connection with corresponding 

 sections of subdivided dial plates, over which rapidly revolving arms are making syn- 

 chronous contacts. 



Hitherto multiplex telegraphy has been limited to direct connections between ter- 

 minal stations ; but this objection has also been provided for by the several inventions 

 herein referred to. 



F. Anderson's Automatic Machine Telegraph. 



"RCCÇVMOT. 



ï\\TvtVv DVe . 



tar tK. 



^acorà.. 



By the above system the Morse dot and dash code of signals is transmitted by means 

 of perforations in a strip of paper, and received either by chemical decomposition or by 

 ink registers. 



The rapid preparation of accurate perforations is therefore of primary necessity. 



In the Wheatstone automatic alternating or double current system each integral part 

 of a character or letter is perforated separately, and such operation is therefore much 

 slower and less accurate than if each letter was punched out by a single movement. 

 Nineteen punch dies (including the feeding row) are required for such system. 



By the Anderson single current system much simpler perforations, requiring but six 

 dies, are necessary, the holes {vide diagram) representing the spaces between each dash or 

 dot, and each complete letter of the alphabet being punched out by a single type-writing 

 movement. 



The transmitter is placed in a shunt from line to earth, the battery being normally 

 connected to line. 



