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From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: ELECTRO-CHEMICAL ELAPSED TIME INDICATORS
Date: Sat, 14 Dec 2024 14:29:38 -0500
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There was a question (from Larkin?) on non-electronic time delay
components, and I recalled such a thing from the 1970s, when I
considered using it to sequence an electromechanical gadget.  Turned
out to bet too complicated in that application, and went to a CMOS
counter.

Anyway, the name came to me today, and it is still made.

Curtis coulometers are analog Elapsed Time Indicators (ETIs) which use
an electro-chemical plating process to integrate current over time.

..<www.curtisinstruments.com>

..<https://lampes-et-tubes.info/uv/Curtis_coulometers.pdf>

This uses mercury, but if I recall correctly, the 1970s original used
silver.  I think it was called a coulcell.  The original company seems
to be gone.

Joe Gwinn