[rollei_list] Re: OT: Replacing Mercury Cells in a Nikon F
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sat, 3 May 2008 19:50:21 -0700
It takes about 1/10th the mercury to make a PX
625 as that which goes into a "Compact Fluorescent Light".
Go figure.
Me? I use silver-oxide cells and my slides come out just
fine.
Marc
This is a great puzzle. Someone told me that there is a
recycling program for fluorescent lamps but not for mercury
cells. If that is why there are no mercury cells on the
market it should be remedied. I doubt if many fluorescent
lamps, compact or tubular, get recycled by individuals
despite the content of mercury and perhaps other toxic
substances in the "phosphor" coatings.
I have no idea how long the zinc cells will last but
they are cheap and worth the effort.
As you say mercury cells have a very flat discharge
curve and extremely long life when not loaded. Mercury cells
used to be used for bias cells in some electronic devices
where their constant voltage and long life under very low
load conditions were desirable. This is an application where
other types of cells probably are not usable.
Its not too difficult to make a voltage regulator which
will put out virtually constant voltage of any desired
value. A higher voltage battery is needed but any voltage
higher than the regulated value will do. Such a regulator
could probably be fitted into the case of the Nikon finder
or into most other devices using mercury cells. I think
regulator is what you mean by bridge which is something
else.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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