I found this Ah ( Amprequadraaturen )meter while doing a clean up in my basement.
I got it from a power utility in The Netherlands in the 80's to add to my collection.
Any ideas where this was used for?
On DC applications Ah meters are used but this is an AC meter.


[Linked Image from electrical-photos.com]


[Linked Image from electrical-photos.com]


The product of rotation, excitation and flux produces electricty.