Se (la korah) era di paglia o di canne, è visto come se fosse fatto di metallo. [R. Yehudah dice questo. L'halachah non è in accordo con lui.] Se fosse storta, [in modo che un'aria non potesse riposare su di essa (come non potrebbe anche se fosse rotonda)], è vista come se fosse dritta. Se fosse rotondo, è visto come se fosse quadrato. Qualunque sia tre tefachim in circonferenza è un tefach in larghezza. [Cioè, qual è la misura richiesta per una korah rotonda? Qualunque sia la circonferenza di tre tefachim— cioè, qualunque cosa richieda un cavo lungo tre tefachim per aggirarlo —avrebbe, se al quadrato, una larghezza di un tefach. Perché così troviamo con l'igname (il serbatoio) fatto da Salomone, vale a dire. (I Re 7:23): "E fece l'igname fuso, dieci cubiti da un bordo all'altro, tutt'intorno ... e una linea di trenta cubiti lo compose attorno"— da cui si vede che per ogni cubito di larghezza nel cerchio, ci sono tre cubiti di circonferenza.]
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).
