My Grandad lived in the Dumbiedykes in Edinburgh in the 20s and 30s.
He was a coal merchant and was relatively well-off for the time and was one of the first to have the new fangled electricity run into his house. It was presented as two hanging lamp cords and the original intention was to use them as, well, hanging lamps. The ease-of-use and massive safety improvement over gas-lighting were the main selling points.
But like us with our welders and our tools, he soon discovered that having this supply opened itself up to all manner of upgrades and new exciting kit to buy; an electric iron! an electric fire! an electric hob!
But he became frustrated with just having the two hanging pendant sockets so he did what we also do; he implemented a "network" of sockets all over the house so he could run all of his gadgets at the same time (I suspect that "diversity" was not well-understood in these days )
Only problem is that the wired fuse (he thinks it was 1A) kept blowing. So he'd replace it with 5A fuse wire. Then 10A wire. Then mains cable. Then, and I kid you not, a nail.
Blew the main fuse out in the street and plunged the Dumbiedykes into darkness for days (they weren't geared for the same level of diagnostics as they are today).
The man from the Scottish Electricity Board gave him a stern lecture about what fuses were for.
So if anyone ever tells you that a nail-as-a-fuse is an old-wives' tale, I can assure you that it's not
Ah I was wondering what the rating was of the piece of bolt fitted to this welders plug as it must have worn (warmed) off, but now with that handy guide I can see it was a 1500 amp slow blow
Gives enough time to warm up the transformer