Here are two photographs showing the continental Morse code signals
used in cable working and the signals as they are received by the
siphon recording instrument at the receiving station. This siphon
recorder is in practical use in the cable world. The dots and dashes
sent into the wire on one side of the ocean according to the Morse
code, cause the siphon recorder through the means of electrified ink to
make a waving line on a tape. The signals are readily reducible again
if necessary to the dots and dashes of the Morse code because dots make
deflections to one side of the center of the tape and dashes to the
other. The operator who receives the message can therefore readily read
it.