[Avodah] Re: standard measures?

[Danny Schoemann]

RMB:

> I don't know what he would do with a kezayis. Would he follow R Chaim
> Volozhiner, because the nearest thing to a subjective olive is using
> the more available olive in NCyour own region and time?

I'm pretty sure it's a Mishna - to use a medium sized olive, each chochom
using what he has available.
(R Yehuda says to take the biggest and smallest you can find and divide
volume by 2. Counterargument: how do you know you found the biggest and
smallest? Safer to use a medium sized one.)
But embarrassingly so I cannot locate this Mishna. Even electronically.
(I usually finish Shas Mishnayos thrice yearly. But for round 41 I decided
to use Kehati again, and it's taking me 9 months.)

Also see the the Rambam at the end of Keilim ch. 17 (last sentence) where
he writes:
Ein medakdekim b'chol hashiurim ho'eilu shekoolom hen midivrei sofrim.
(When measuring strange shaped earthenware ovens we don't measure very
accurately is it's Rabbinic impurity.)

Obviously not applicable across the board.

Kol Tuv

- Danny
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