It is a milliampere metre from A. Gaiffe, so likely before 1895. It seems to works with electrolytes bottles (one has a lid broken) . I am trying to find some information on how it worked, and ideally put a date on it.
Does it contain harmful substances, I presume the corrosion comes from long exposure to oxygen and humidity and electrolytes.
What I have found is that the company changed name in 1895. Then had different names or has Been bought. Then bought again and again. Now it is part of GE France.
I cannot find similar apparatus on internet
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