"dee" refers to a dot, and "dah" refers to a line. By "dee daa thing" do you mean the electric telegraph?

The electric telegraph was a device which let people communicate nearly instantaneously over long distances. There were actually many different kinds of telegraphs invented over the years, and only some used morse code. The ones which did had a switch: a short flick of the switch sent a dot, holding the switch on with a longer delay sent a dash, and people would sent letters and words by using a common, predefined sequence of dots and dashes which I've provided above. For example, the letter "A" is denoted by ".-", a dot and then a dash; so to send "A" through a telegraph, one would flick the switch on then off quickly, then flick the switch on and hold for a moment longer before off, then pause so that the operator knew they weren't sending a letter like "J" (denoted by ".---") which starts the same but has more dots/dashes.

The first working telegraph was built by the English inventor Francis Ronalds in 1816 and spanned 8 miles. I can give you more information about telegraphs like that if you want. Also, different telegraphs sound different: if you want to hear a telegraph you will have to check out an external site like [Videvo](https://www.videvo.net/royalty-free-sound-effects/telegraph/). Let me know if this answers your question or how else I can help you.
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