[Hallicrafters] Blooming meter: my explanation (I think)

[kwylow zinjanthropus]

I have had a few of these old meters "bloom" in my old rx's (and it's not limited to Halli's either).

You figure that the meter cases were made of cylindrically bent brass pieces of metal. Well, as time progress (you know, 50 years plus), the brass tends to crystallize and fracture. The case hasn't been stressed relieved (i.e. put over a flame to soften out those stress points as a result of the cylindrical bending). Well, the case now splits at various points which results in the "petaling" effect you see (aka a "bloom"). 

So....whadya think of that explanation? I did o.k. in my materials class and did manage to pass Navy Nuke School before becoming "nuke waste" at Arco, Idaho back in 1984. Let me know what you think. Cal. N6KYR. 



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