While at daughter.1's gaff on Thursday, I was presented with a broken bubble gun; ladysolly claimed that I could fix it. I'm always up for a challenge, but after a quick look, I said that I'd have to take it home to work on it.
I do find that repairing things is very satisfying - a new gun would cost about £3, but where's the pleasure in that?
Today, I dismantled it. Six small screws split the case and revealed the workings, which are simple but ingenious. It's powered by three AAA batteries. Pulling the trigger switches on an electric motor, and powers up a blue led that gives a nice effect. The motor powers a blower which uses the Bernouilli effect to pull bubble mixture out of a reservoir and blows out out of the nozzle. So you get attacked by a blue-lit stream of small bubbles.
And some parents give their nine-year-old a submachine gun to play with!
Careful inspection revealed that a wire was no longer attached to the trigger. So I soldered in a bit more wire, reassembled the gun, reinstalled the batteries and pulled the trigger. I was immediately rewarded with a whirring noise, a blue led lit up, and I could feel the air blowing out of the nozzle. Sadly, I don't have the necessary bubble mixture for a live ammunition test, but I'm sure that grandson.1 will have some.