Definition:Apothecaries' Ounce/Mistake

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Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary
$24$


1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary
$24$


Mistake

... Also $24$ scruples in an ounce, and ...


It is not made clear that this is an apothecaries' ounce, not an ounce avoirdupois, which is some $10\%$ lighter.


Sources