SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Morse transmitter. Handset of a telegraph transmitter used to send Morse code. The operator is tapping out the code on the button at centre right. This sends an electrical signal through the wire (top left). Short and long electrical signals are used to represent the dots and dashes of the Morse code. The code is seen printed on the handset. In this way, messages can be sent to a receiver that converts the signals into a printout of dots and dashes, which can be translated back into a message.
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