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Telegraph photography 
Early electrical equipment for telegraphic transmission were invented by American Samuel FB Morse in 1837, and in that same year by the English physicist Sir Charles Wheatstone in collaboration with the engineer Sir William F. Cooke. The basic code called Morse code messages transmitted by electrical impulses traveling along a single cable. Morse apparatus, which issued the first public telegram in 1844, had a power switch. By pressure of the fingers, allowing the passage of current during a certain period and then cancel it. 
original Morse receiver available electromagnetically controlled pointer that drew lines on a piece of paper on a revolving cylinder. The lines were long dependent on the duration of electric current flowed through the wires of the electromagnet and had the appearance of dots and dashes. Since the telegraph was too expensive to be deployed universally, different methods were developed to send multiple messages simultaneously by a single line. In duplex telegraphy, the first advance this type, a message can be transmitted simultaneously in both directions between two stations. In 
quadruplex telegraph, invented in 1874 by Thomas Edison, transmitting two messages simultaneously in each direction. In 1915 the telegraph was introduced that allowed multiple simultaneous transmission of eight or more messages. This and the advent of teletype machines in the mid-twenties, was that the system was phased out manual Morse telegraph key and its replacement by wire or wireless methods of transmission over the air.
Early electrical equipment for telegraphic transmission were invented by American Samuel FB Morse in 1837, and in that same year by the English physicist Sir Charles Wheatstone in collaboration with the engineer Sir William F. Cooke. The basic code called Morse code messages transmitted by electrical impulses traveling along a single cable. Morse apparatus, which issued the first public telegram in 1844, had a power switch. By pressure of the fingers, allowing the passage of current during a certain period and then cancel it. 
original Morse receiver available electromagnetically controlled pointer that drew lines on a piece of paper on a revolving cylinder. The lines were long dependent on the duration of electric current flowed through the wires of the electromagnet and had the appearance of dots and dashes. Since the telegraph was too expensive to be deployed universally, different methods were developed to send multiple messages simultaneously by a single line. In duplex telegraphy, the first advance this type, a message can be transmitted simultaneously in both directions between two stations. In 
quadruplex telegraph, invented in 1874 by Thomas Edison, transmitting two messages simultaneously in each direction. In 1915 the telegraph was introduced that allowed multiple simultaneous transmission of eight or more messages. This and the advent of teletype machines in the mid-twenties, was that the system was phased out manual Morse telegraph key and its replacement by wire or wireless methods of transmission over the air. 
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