Jeff Liebermann wrote:
On Mon, 13 Feb 2017 23:30:17 -0500, "Michael A. Terrell"
wrote:

Jeff Liebermann wrote:
Sorta. The timer was basically a miniature electroplating bath, which
used a the current flow to move ions of something, from one end of a
glass cylinder to the other. A coulomb is 1 amp for 1 second and can
count both electrons and ions, as in the bath.
http://www.electrolytics.org/faradaysLaw.html
I have a box buried somewhere with the project notes which might have
the data sheet. Meanwhile, I think I may have found the patent, or
rather a later patent as the one I used was in about 1976:
https://www.google.com/patents/US6198701
I'll dig through the citations later...

http://oakbluffclassifieds.com/Funny-Listings/Very-Funny/Curtis-elapsed-time-indicators-520LNA-115-240-indachron-picture-3.jpg

Bingo:
http://download.siliconexpert.com/pdfs/2010/11/28/5/7/11/117/crts_/manual/120-pc.pdf
That's it except the one we were using was the PCB mounted model,
something like the 620PC model:
https://rcfreelance.com/IC/MS3311-3/
Curtis Instruments is still around. The mercury coulometer product
does not appear on their web site, but is mentioned in the company
history at:
http://curtisinstruments.com/?fuseaction=Company.Anniversary

Thanks much.

You're welcome. I have heard they stopped making them, after some
old ones caught on fire and did a lot of damage.


--
Never **** off an Engineer!

They don't get mad.

They don't get even.

They go for over unity! ;-)