I just realized something :
78 rpm --> 7+8 = 15 ---,> 1+5 = 6
45 rpm ----> 4+5 = 9 or "6" upside-down
33 rpm ---> 3+3 = 6
The faster the speed, the better the sound, but the actual speeds are arbitrary.
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There are technical reasons for the speeds such as convenient gearing to 50/60hz synchronous motors and 33RPM matching the speed of film projector
Yep. Some of our technology is from military leftovers. Not necessarily in this case, but--
I wouldn't be surprised if like, an ammunition feeder motor on a Mk45 5"/54 pushes powder using a 78rpm motor, and after the war we had a surplus of very specific parts to sell to the populace.
This is possible I guess, but why the three different speeds through the decades though?
And the invention of recording onto wax cylinders was the first of all, and honestly that's one invention I see no military origin in. It seems like those wax cylinders were still innocent.
I only meant to provide account that innovation is oftentimes downstream of surplus.
Whether that applies to this case, you're a better judge than I would be.
Eh...maybe so, maybe not.