Wenn es (die Korah) aus Stroh oder Schilf war, wird es so gesehen, als wäre es aus Metall. [R. Yehudah sagt das. Die Halacha stimmt nicht mit ihm überein.] Wenn sie krumm wäre [so dass ein Ariach nicht darauf ruhen könnte (wie es auch nicht könnte, wenn sie rund wäre)], wird sie als gerade angesehen. Wenn es rund wäre, würde es als quadratisch angesehen. Was drei Tefachim im Umfang hat, ist ein Tefachim in der Breite. [Das heißt, was ist das erforderliche Maß für eine runde Korah? Was auch immer drei Tefachim im Umfang ist— dh, was auch immer eine Schnur benötigt, die drei Tefachim lang ist, um sie zu umgehen —hätte, wenn quadratisch, eine Breite von einem Tefach. Denn so finden wir mit der Yamswurzel (dem Reservoir), die von Salomo hergestellt wurde, nämlich. (1. Könige 7:23): "Und er machte die geschmolzene Yamswurzel, zehn Ellen von Krempe zu Krempe, ringsum ... und eine Reihe von dreißig Ellen umfasste sie im Kreisverkehr."— woher ist zu sehen, dass es für jede Elle Breite im Kreis drei Ellen Umfang gibt.]
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).
