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A treasure to find. This is the only book I could find that went into great detail on the inner workings of Ferraris induction meters, the standard mechanical (analog) electrical meter used all during the 20th and into the 21st century. The Ferraris meters were discontinued in the late part of the first decade in favor of digital meters.
The writing is clear; the drawings exquisite, the math easy to follow.
I was pleased to have found it.