[ Herb Lindahl wrote in 100422 MMDigest:
> I would like advice as to a more modern, safer switch that I could
> install in its place.
I offer this with some trepidation, but so far have no reason to doubt
its' worth. I acquired a heavy duty, glass encapsulated mercury switch
and wired it into the circuit for the cup and finger of the original
Welte switch. I found a suitable position on the linkage which would
allow a full make or break of the mercury pool and affixed the capsule
to it with a small cable tie or two.
The switch probably has some type of identification number and I remember
it was made by General Electric, probably sometime in the 1920s. It
uses a pair of heavy but still very flexible leads, insulated with
small porcelain beads, and it doesn't heat up in the least even after
hours or more of use. And over a couple of years time.
If there is interest, I can probably find a number on the glass -- but
again, this switch is a real antique. A better solution might be to
use a smaller switch to control a 110-volt relay with suitable
contacts. I just happened to have this switch on hand.