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Good question Scott. I suspect it has something to do with glare coming off flat lenses. I'm sure that by the end of the day we will have a definitive answer.
Ok, here is the real reason. Triumph didn't know how to make flat glass so they used up what they had. Or is it because there is so little light in the gauge that you need all the help you can get to see it in the dark. Sorry, I had to say it.
Ok, here is the real reason. Triumph didn't know how to make flat glass so they used up what they had. Or is it because there is so little light in the gauge that you need all the help you can get to see it in the dark. Sorry, I had to say it.
Early TR4's had the same curved glass in their guages as TR3A's, including the new electric temp guage.
The glass became flat when TR4 guages were changed to having a shroud over the needle, which concentrated night back lighting onto the measurement scale instead of the whole guage.
I believe the curved glass was a means of cutting reflections on the speedo, and used on the other instruments for the sake of uniformity.
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