So sad to read the misleading stuff here. The original morse sounders used a large relay which went "Click" when operated and another "Click" when released. (s

So sad to read the misleading stuff here. The original morse sounders used a large relay which went "Click" when operated and another "Click" when released. (some will argue that it's "Click-Clack", but that makes no difference) So a Dit sounds like Click/Click, while a Dah sounds like Click ..... Click. Which is how only one sound (plus spaces) can encode morse. In other words it's all in the rhythm of the sounds. Years ago, divers were taught to send morse by holding a spanner in their fist, and rocking it back and forth against the hull (eg click/click) in exactly the same way as the armature in an original morse sounder operated. And yes, there is also a completely different system called the "Tap Code".