Author Topic: ae type 24 dial plate - black  (Read 2956 times)

Offline Doug Rose

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Re: ae type 24 dial plate - black
« Reply #15 on: October 27, 2015, 07:50:18 PM »
I have "no glow" as well. At least on the dial plates. A little JD is a good thing....for medicinal  purposes only.....for a glow as needed. It was a tough Tuesday!!    :o...Doug
Kidphone

unbeldi

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Re: ae type 24 dial plate - black
« Reply #16 on: October 28, 2015, 09:56:12 AM »
Does anyone have a luminous plate?   Do they glow redish or green-blueish?

I suppose I would expect the phosphorescence to be redish, if they were made in the 1930s or 40s, because those zinc sulfide-based formulations came before the later ones with higher efficiency.  The color is determined to a great part by the doping of the material with various metals, in particular copper, magnesium, aluminum.

The radio-luminescent paints deteriorated rather quickly, I think. It is not that the radium's half-life limits this, but the material itself becomes inactive.

Use your favorite Geiger-counter to check the plate.  ;D


Offline AE_Collector

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Re: ae type 24 dial plate - black
« Reply #17 on: October 28, 2015, 11:02:13 AM »
Can't get the numbers to glow.  Either it's just white paint or the luminous material has faded to the "off" position.

Or the lithium batteries are depleted....or were they Ni-cads back then?

Terry

Offline andre_janew

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Re: ae type 24 dial plate - black
« Reply #18 on: October 28, 2015, 11:06:04 AM »
I'm not sure, but I think the Ni-cads came first.