What are/were they meant to represent? When were they introduced? I can’t find any consistent reliable sources. I’d really appreciate references if anyone has any!
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It’s circuit based but lot of people seem to get confused because of thr shape.
It’s a very old, 1700 or earlier convention that is kinda crazy.
You have a water wheel you want to turn on or off to bring power to your machines. You have two water ways and in order to get power you direct the water down a specific water way.
You put the boards into the water way you want to block to cause the water to flow to your water wheel. Your closing the the eaiser path for the water. When you turn off the power requirement you remove the boards and this lets the water through the gap.
When we got to steam and electricity the same concepts are there, just represented differently. For steam you open ( this opening a pipe ) to let the steam out to turn something off. You close or cover the pipe to turn it on. Open is O.. Closed is I like a board or a metal cover.
Electricity the same thing, except for electricity there isn’t a visible change.
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