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Post  Levent Suberk on Tue Dec 18, 2018 9:27 am

Advertisement of an interesting glow head visual indicator from RCM magazine October 1978 issue:

Hot-Hed temperature indicator Hot_he10
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Post  GallopingGhostler on Tue Dec 18, 2018 11:09 am

Head paint on a McCoy Red Head .35 is also a temperature indicator.  Warm Popcorn lol!

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Seriously though, nice find, Levent.  Thumbs Up  cheers  Beer Cheers  I didn't know such existed 40 years ago. Today, one can buy an electronic temperature reader for under $25. Back then though, they were expensive and beyond a hobbyist's means.

Your post reminded me of this, but in reality the darkened Red Head paint I got used is most likely painted with the wrong paint by a previous owner.  Doh!  Paranoid

Back then we were coming out of the slide rule era. I bought my first scientific calculator, a Texas Instruments TI-58 programmable calculator for college, cost me $104 + tax. ($402.02 today). I was on my own. Some of the kids whose parents were supporting them asked me why I didn't buy an Hewlett Packard calculator. Those cost $400 ($1,546.25 or €1,360.68 now). One got a then new Ford Mustang convertible for college. I was riding a well worn 1971 Honda CB100 motorcycle.
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