The electric telegraph to son based on the use of an electro-magnet, that is to say a coil of wire wound around a piece of soft iron, in which it circulates an electric current. This system is a temporary magnet whose field magnet exists only when the current flow. Thus, one can create a back and forth frames feature a spring by magnetization. The magnetic attraction will occur and stop as many times as they open and close the electrical circuit. The operation of the telegraph based on this principle.
A telegraph installation consists of:
- a source of electrical energy (eg Daniell cell).
- a transmitter used to send signals.
- son of a line of drivers.
- a receiver.
The Morse telegraph was the first practical telegraph and one of the employees.
A telegraph installation consists of:
- a source of electrical energy (eg Daniell cell).
- a transmitter used to send signals.
- son of a line of drivers.
- a receiver.
The Morse telegraph was the first practical telegraph and one of the employees.
Telegraph The principle is to safeguard recorders track of mails sent.
To do this, Samuel Morse (1791 - 1872) was a painter and inventor who developed the American telegraph which bears his name and in 1832 the corresponding alphabet. This system was patented in 1840.
Morse Alphabet is composed of combinations of long and short signals called dots and dashes.
length of 1 dash = 3 points
interval between two signals
= 1 point interval between two letters = 3 points
interval between two words = 5 points
operating principle of the telegraph Morse
- The manipulator consists of a wooden base on which are fixed two terminals P and M and a lever, with two switches, which can oscillate vertically. - In its resting position, the spring keeps the lever from the P terminal
- When you want to send a message, pressing the lever handle to get in touch with the terminal P one of the lever switches. The current flows and is interrupted as soon as you release the lever returns to its position rest through the spring.
handling of transmission is thus greatly simplified.
- The receiver operates with an electromagnet connected to the wire line and the Earth.
- When a current reaches the plate of soft iron electro-magnet is attracted and repelled by the spring following the opening and closing of the current.
- The lever is moved and oscillates. It is a point which presses a paper strip.
The length of the trace left on the paper depends on the duration of current flow.
ticker tape bronze campaign 1914-1918, in wooden carrying case with inscription "Military Telegraphy" marks CH. MILD & Co. PARIS.
Property of the main hall of the 18th Signal Regiment.
Telegraph Morse tape recorder used for instruction in the 18th Regiment Engineering
manufactured by Sergeant VERMANDER in 1936.
Property of the main hall of the 18th Signal Regiment.
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