These devices were mainly used for learning and exercising the Morse code. The Morse transmitter sends the Morse codes punched into a Wheatstone paper tape over a transmission line or over a radio channel to a receiver which records the transmitted Morse codes.

to 220 characters per minute. In addition, the pause between the characters can be adjusted
up to 7 times the normal length, so that it is made easy for beginners to learn the Morse codes,
when they listen tothem by means of an earphone or a loudspeaker. Since only the pause is
made longer and not the timing of dots and dashes within a character, the sound impression
of a character does not change.

The Morse transmitter was not only used for learning and exercising, but also for regular trans-
missions of text messages. Transmitting the characters by means of a Wheatstone paper tape
is faster and smoother than manually transmitting by operating a Morse key.