This is not an answer to any of the above, but i thought it may be of interest.
I have in my posesion, a 1920,s dimmer switch. It is a large 'jelly mould' shape
in brass with brown ceramic mount.
At first glance it looks like a standard togle type light switch exept for the
size - diam 95mm, depth 90mm - and the fact that it has many ventilation holes
in the brass cover. The toggle however slides up and down. This is connected to
two blades which in turn slide against two sets of carbon pads. Iy was new and
boxed when I found it while clearing out an old store and to my knowledge has
never been used.
It is stamped with a rating of 70 watts & 110 volts DC and after a bit of
digging around I have dicovered that very early electricity was generated localy
and supplied as 110volts dc to a few of the better properties in our town. I
think that the supply was intented for very early domestic lighting only.
Does anyone know anything else/conflicting etc
If in doubt take dimmer out and put in a regular 50-75 cent switch,
If it's solid state dimmer it may be making radio noise
(RFInterference) and is probably more prone to voltage hits. Keep it
simple! Haven't used a dimmer in this house for last 37 years! So
never had to replace one, have maybe replaced couple of switches in
that time period.
Like everything else, with electrcity simplest is best.
Use a three position switch hi-off-medium, use a 3-10Amp
rectifier diode (A15) between hi and medium terminal, line
to common terminal, lamp to hi terminal. Or add a switch
with diode in parallel, then wire switch(hi-medium) in
series with regular circuit. This used to be available as a
coin size "lamp saver" that you placed in a socket, under
the bulb. Perfect for porch & pole lights since the bulb
would last for years.
Large 20 amp diode (or one leg of bridge rectifier-1/4"
terminals) in series with low voltage lighting makes those
4/7 watt bulbs last longer than the fixture ;-)
-- larry / dallas
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