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Giant micrometer - GIF
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Recon what the resolution is, 0.500 inch?
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Yeah - that can't really be called a "micro"meter - maybe just "meter".
It's like the optical engineer I used to work beside, with a wooden yardstick he claimed was calibrated "in wavelengths of light".
Forrest
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"in wavelengths of light"
I would have had to ask the engineer 'what color'.
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Ah - we worked with lighting LEDs, so 450 nM - "royal blue".
All illumination LEDs actually make light at this wavelength, and are coated with phosphor to absorb some portion of this wavelength, and reradiate it at a variety of longer wavelengths, or colors. Our eye mixes all this together as various degrees of "white". There are a couple of boutique LED makers that use a 405 nM "pump" to get some more energy in the near UV area.
He was a smarter guy (a couple Masters degrees as well), but I think I have more patents.
That's better, right?
Forrest
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Depending upon how "stiff" the arc framework is the resolution might be a lot less than .5". I wouldn't be surprised to find it down to nearer 10 or 20 thou.
The problem is at what time of day he seems to be measuring steel, and the gi-crometer looks like aluminium coefficients of expansion would play havoc with that
I suppose it could be made of titanium.
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Mechanical clocks (and electronic ones for that matter) can be compensated for temperature changes. Why couldn't the frame of a micrometer also be?
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It may have to.be calibrated often, perhaps multiple times a day. The extra long "dumb" anvil might play a part here as a way to efficiently calibrate. Just a guess
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maybe even recalibrated before every use
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