As an aside when I was a kid I saw a televisions show about mercury,
and they were floating solid steel objects, like a 12" adjustable
wrench, on a large pool of mercury just like they were toy boats. An
octogenarian coworker of mine says that when he was a kid they would
play with mercury. You could rub it on a penny, and it would "silver"
the penny. Sometimes I’m stunned that he’s lasted so long.
In addition to the light house use for a bearings. Back in time
before the new rules and regulations dealing with mercury. The
mechanical gyroscopes, used on board ships,had the mechanism
floating on mercury in a cup type container standard procedure was to
remove the mercury, wrap it it a number of layers of cheese
cloth,tie it off. Take it over to the sink and wash the dust and junk
out of it. Buy mushing the sack full of mercury, in a stream of
running water. Needless to say that there were times that in got into
the sink and a lot made it into the drain paste the sink trap which
wasn’t that large to hold a lot mercury.
Will look for the navy class book on gyroscope repair, I think i
still have it.