Author Topic: Dial Plate Question  (Read 162 times)

Offline HarrySmith

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Dial Plate Question
« on: April 02, 2020, 04:09:29 PM »
Does anybody know what metal was used for making the dial plates? I know they are porcelain faces but what is the backing? Curious minds want to know! I guess that should be singular, my curious mind. I doubt if anyone else is curious ;D
Harry Smith
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Offline Key2871

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Re: Dial Plate Question
« Reply #1 on: April 02, 2020, 04:54:23 PM »
As far as I know steel. Because you need a hard tough metal to stand up to the process.
Use a magnet on the back, if it sticks it's steel.
KEN

Offline Jack Ryan

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Re: Dial Plate Question
« Reply #2 on: April 02, 2020, 08:06:35 PM »
Does anybody know what metal was used for making the dial plates? I know they are porcelain faces but what is the backing? Curious minds want to know! I guess that should be singular, my curious mind. I doubt if anyone else is curious ;D

Most plates are steel but, as you probably know, a few were plastic (in the 1930s). Also some were steel with a cellulose acetate rather than enamel coating.

The (vitreous) enamel coating is often called porcelain in the US and "enamel" refers to paint. This confuses the issue somewhat but when I say (vitreous) enamel, I mean a material made by fusing powdered glass to a substrate by firing. When I say porcelain, I mean a ceramic material made by heating clay-type materials to high temperatures.

Jack