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Because they're designed that way. A tuning fork can be, well, "tuned" to have any desired frequency.

If these are for tuning Musical Instruments, they sound like very old Tuning Forks. The "middle C = 256 Hz" scale was in limited use at one time, but by modern standards (where the A above middle C is tuned to 440 Hz, or in some cases even higher) is a bit on the low side. Tuning your instrument to C=256Hz will make it sound "flat".

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13y ago

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