On 01/29/2013 03:20 PM, John Rehwinkel wrote: > I did some research a while back on photoetching services, and found one that > will etch from the front, the back, or both at the customer's option. They > point out that this gives a profile to the etched object. I figured I'd etch > from the back for nixie cathodes, so the front (facing the viewer) surface > was the largest. Since we'd be etching pretty thin material, I doubt it > would be a big problem. If you are etching from the back, the *back* side will be the largest. I do not think, though, that this will make much of a difference because the actual glow emission does not happen on but just above the electrode surface. In the nixies I have seen it appeared to me as though the diameter of the light-emitting part of the neon gas was large compared to the width of the numbers.
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