[78-L] how long is it?
malcolm at 78data.com.invalid
Sun Sep 25 12:23:12 PDT 2016
I just got an interesting question from a friend who has nothing to do
He asked: "If a record didn't go round and round but a 3 minute
(groove) went straight, how (long would the groove be)?"
To which I replied: "There's got to be a math formula for this - how
does one figure out the length of a decreasing spiral over 2 radial
dimensions? First, you'd have to know the pitch of the groove - that's
how many lines per inch along a radius the groove makes. Secondly, you'd
have to measure the inside and outside radii of the spiral. I think
that's all that is needed to plug into a set formula.
Someone in 78-land will know this.
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