Subduplicate ratio, The ratio of
their square roots.

Duplicate ratio. The ratio of
their squares

Thus the duplicate ratio of 2 to 4
is the ratio of 4 to 16.

and the subduplicate ratio of 4
to 16 is the ratio of 2 to 4.

" f "

1 : 3 ::4

4/12 feet to vibrate in 2 seconds

4 : 2 : 1 1 : 2 : 4

4

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