45worlds Forum - View Single Post - The length of a 20:00 groove

27th Jul 2021, 8:41 AM
	Break-In Master Member since Dec 2013 251 Points	How many feet is in an album groove that plays 20;00? The problem is, the groove at the outermost is 37.700 inches but, each spiral inside of that is a fraction shorter so, you can't multiply 37.700 times the number of rounds it'd take to track the entire length of the groove. 33.3 x 20 = 666. So, 666 x 37.700 = 25,108.2 inches! That's 2,092.35 feet! 697.45 yards That's just under half a mile. That means that I can actually walk the length of a 20;00 groove in just under 5;00!! BUT, that's IF that number I got is accurate! But, as I said, with each round, the spiral gets a tad shorter so, that 25,108.2 is inaccurate! The only way I can think of to get an accurate measurement, assuming the wheel isn't going to slip at all on the surface of the record, is to get a much tinier version of one of those measuring devices they put on the back of a car (a bicycle wheel attached to a kind of odometer) that can be attached to the front of the needle playing said record. I would think a manual turntable would be best so that It could be stopped at the very end or just before, at which point, you could just spin the record by hand until you get to the absolute end of the groove. It might also be more advantageous to use a record that plays from the inside out.

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