The New Zealand Railways Magazine, Volume 13, Issue 7 (October 1, 1938)
Trial and Error
Trial and Error.
An electrician was working on an emergency wiring job. Turning to the apprentice who was helping him, he said, “Say, Bill, take hold of the end of that wire.”
“All right.”
“Feel anything?”
“No.”
“Well, then don't touch the other one, it's got over 5,000 volts.”