Black Bulb in Vacuo - Help!



I am sorry to raise this question again, but I am really struggling to find
a company still manufacturing Black Bulb in Vacuo thermometers. I believe
Dalton used to, but isn't this company now defunct?

The literature suggests that they are still quite widely used, so surely
there must be one company at least still producing them.

Any help would be gratefully received.


Mike

Pitsford Hall
Northampton


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