hmm, i was cleaning up my desktop just now and came across a draft i must have been toying with for this thread. i barely remember it. anyway, guess i'll paste it in and vamoose!
The operators where aware of the shock hazards. They would place plywood in the floor of the machines that packed the biggest jolts. I guess three prong plugs finally reduced the chance of a big shock.
We have a problem with the grounds here at home. Somehow there is a potential difference between the two sides of the breaker box. This has caused real problems with hum in my audio systems. Power line based intercoms only work on half the outlets in our house. The cable TV connections always have a good tingle waiting for you.

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interesting... and i need to learn more about AC and electronics. there is a neat little app ("everycircuit") on android i downloaded a couple weeks ago on my tablet. it's a construction set for circuit boards, allowing you to place and arrange all the components represented by their traditional symbols on breadboard / diagram, then to power it on and see what actually happens. then you can measure values via 'scope and multimeter on whatever portions you select. here i am mostly doing internet and time-wasting games on my tablet, while something that's like forrest mims-squared is sitting there waiting for me! *bonking self on head*
oh, and for that photo, i was imagining a conversation between two guys:
...
"well, tomorrow's saturday, ralph... you psyched for our fishing day?"
"fishing day?? ed, we said pinball. we agreed on pinball."
"pinball??? hahaha, are you nuts... why would we get up at 5AM to play pinball??"
"look, we already agreed a while back on pinball, even though you've obviously forgotten. the tournament is coming up and we agreed to play pinball, not fish."
"pffff. are you nuts? YOU'RE the one who likes pinball. i only agreed to go because you agreed to bar-hop afterwards!"
"ed... listen to me... i HATE fishing. it's the most boring godamn thing i've ever done. i went ONCE with you, and that was the time i realised that it was the most boring godamn thing i've ever done. the fact is, you agreed weeks ago to play pinball, NOT FISH! ed, i'm playing pinball tomorrow and that's that. are you coming or not?"
"ralph, i don't care. maybe i said that, maybe i didn't, but the fact is, tomorrow's saturday, and that's the one day a week i can get up early and go fishing. tell you what-- i'll pay your bar tab if you come along. you can bring your tablet along and play pinball games on that-- whaddya say?"
"TABLET?? you think i'm playing on a tablet to get ready for an actual tournament??"
"haha, then bring the real thing along. i dare you. matter of fact, i DOUBLE-DOG dare you..."
"^&%@#$"
"hahahaha, i TRIPLE-DOG dare you, ralph!"
"alright... alright... hooters, then."
"what?"
"not just any bars. hooters. and you pay for everything. and that's it... no bar-hopping, just hooters. and i'll play pinball while you fish."
{very long pause}
"in the middle of the stream."
{even longer pause}
"yes, fine."
"HAH! i'd like to see you try."
...
that saturday: