Products > Test Equipment
Can anyone age this Crompton Parkinson Ammeter?
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Chet T16:
Evening all,

Has anyone any idea how old the attached would be?
Wallace Gasiewicz:
Well, if it's made in England, it must be an antique for sure

Same goes for made in the USA

Interesting. Cannot seem to find anything very meaningful

Country-of-origin marking laws were first enacted in the 1880s in various European countries* to distinguish imported goods (particularly German goods) from domestic goods, and became mandatory in the United States in 1891 with the enactment of the Tariff Act of 1890 (p. 1-3).

Crompton Parkinson was a British electrical manufacturing company. It was formed in 1927 by the merger of Crompton & Co. with F & A. Parkinson Ltd. The brand is now part of Brook Crompton.
Gyro:
It looks like an educational meter to me, the sort of thing you might find in a school lab. My guess would be 1930s-40s.

I can see a red wire at the back of the movement, the insulation composition would probably be a clue.


EDIT: Looking at the case construction, it's possible that it might have been cut down from a larger meter by an enterprising Physics master. A lot of school lab equipment was created by the schoolmasters in those days. No, from the later photos, that looks as if it was made for the purpose.
Chet T16:
I popped the top off to have a look inside but haven't went any deeper into it.

Any clues in the pics?
Psi:
To me those wires don't look original.

Yeah, I also think it's educational.
It may have been hand assembled in very low volume for a handful of schools.
Perhaps even by a professor with some woodworking skills.
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