Se (o korah) fosse de palha ou junco, é visto como se fosse de metal. [R. Yehudah diz isso. A halachá não está de acordo com ele.] Se estivesse torta, [de modo que um ariaca não pudesse repousar sobre ela (como também não poderia se fosse redonda)], é vista como se fosse reta. Se fosse redondo, é visto como se fosse quadrado. Tudo o que tem três tefachim de circunferência é um tefachim de largura. [Ou seja, qual é a medida necessária para uma corá redonda? O que quer que seja três tefachim na circunferência— ou seja, o que requer um cordão de três tefachim para contorná-lo —se ao quadrado tivesse uma largura de tefach. Pois assim encontramos com o inhame (o reservatório) feito por Salomão, viz. (I Reis 7:23): "E ele fez o inhame derretido, dez côvados de aba a aba, em volta de toda a volta ... e uma linha de trinta côvados a cercou"— de onde se vê que para cada côvado de largura no círculo, existem três côvados de circunferência.]
Bartenura on Mishnah Eruvin
היתה של קש ושל קנים – Rabbi Yehuda stated this but the Halakha is not according to him.
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English Explanation of Mishnah Eruvin
Introduction
This mishnah is a continuation of Rabbi Judah’s words from yesterday’s mishnah. Rabbi Judah held that the cross-beam need not actually be strong enough to support a half-brick.
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Bartenura on Mishnah Eruvin
עקומה – the small bricks are not able to rest upon it (when it is curved) and similarly when it is round, a small brick cannot rest upon it.
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English Explanation of Mishnah Eruvin
If [the cross-beam] was made of straw or reeds, we look at it as if it was of metal. If the cross-beam was made of a material which could not hold a half-brick, Rabbi Judah considers it nevertheless as if it was strong enough to do so.
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Bartenura on Mishnah Eruvin
if it has in its circumference: Which is to say, what is the round measurement required to render [the beam] proper? Anything that has in its circumference three handbreadths, which requires a string of three handbreadths to encircle it around, it is known that it has a width (diameter) of one handbreadth, if you divide [it]. As so do we find with the basin that Shlomo made (II Chronicles 4:2), "ten ells from its edge to its edge and five ells of height and a line of thirty ells encircling it around." Hence for every ell in width (diameter), there are three ells in circumference.
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English Explanation of Mishnah Eruvin
[If it was] curved we look at it as if it were straight. If it was curved, it also could not hold a half-brick. Nevertheless, Rabbi Judah holds that it is valid.
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English Explanation of Mishnah Eruvin
[If it was] round we look at it as if it were square. Whatever has a circumference of three handbreadths has a diameter of one handbreadth. Again, a round cross-beam could not hold a half-brick. However, it still must be wide enough to hold a one handbreadth half-brick. In order for this to be true, it must have a circumference of three handbreadths (the rabbis knew that pi was roughly three to one, and they knew that this was not exact).
