Example of telegraph signals recorded after transmission over submarine cables. Distortion during transmission over the long cables changed the sharp 'on-off' signals of morse code into a sequence of more gently fluctuating waves of electric current. These signals were recorded as wavy lines on paper tape. The tape was cut into sections and glued on to sheets of paper for later interpretation by trained operators.

The example tapes here originated in the early 20th century.

Object ST 041288 Telegraph Gum Pot is a device used to apply glue to the back of the telegraph signal tapes.

Physical Description

Several lengths of paper tape carrying traces of fluctuating signals displayed as wavy lines. Tapes adhered to paper form carrying printed annotations for recording details of message receipt such as time and date. Form glued to sheet of thin card.

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