There is no category for electrical devices.

Or musical instruments for that matter.
I was thinking I'd like to be able to bow my guitar, but it won't work with a straight bow because the strings are not arched like they are on traditional bowed instruments. Thinking of how a
hurdy-gurdy works, I decided to make a turning wheel. It was easy!
I 'm going to post a recording very soon (like after I eat dinner).
Yes, that is a battery and a switch taped to the side of a film canister. A motor inside turns the wheel, which rubs the strings and makes them vibrate. I need something to put on the edge so it doesn't skip so much.
And
here is the recording! This is a tune I've been playing around with for a while, and it's going to turn into an awesome song, I'm sure.
My brother found a hair band that fit around the wheel, which helps a little, but the seam sticks up and just picks the string very quickly instead of bowing it. It's an interesting sound, but not really what I'm after.
Have a look at [link]
I'm sure I read somewhere that the wheel he uses is rubber or nylon which may have enough "stick" to not need rosin. Also you can see the cotton wool wrapped round the strings where they rub against the wheel.
All good fun
Jim