Insights into the kind of crap 78-rpm records were made of, and other scarce technical infos.
If you’re not sure what ‘a record’ is, or haven’t ever seen one, you’re excused.
Oh, and by-the-way, 78 is the approximate number you get when you rotate a 46-tooth gear with a 3600 rpm motor. (60 cycles per second.)
Further wisdom such as this is found by the ton here: http://www.78rpmrecord.com/links.htm
I always thought it would be neat to use a laser or high resolution scanner to image a record have a computer analyze it and convert the images to audio. Not sure if this has been done, but if not it would be cool to figure out.
It has been done! https://ofersp.github.io/digital_needle/
Nice!
There is indeed a way to use lasers to read 78s without touching the surface, and the gear is availble. Though probably not at a price most of us would like. Here’s one example: https://www.elpj.com/ But after decades of work, they seem to have problems … /Laser_turntable#Performance