Si elle [l'extension] s'est détachée du poêle, si elle est haute de trois doigts, elle contracte l'impureté par contact et à travers son espace aérien; s'il était plus bas ou s'il était lisse, il n'est pas sujet aux impuretés. Si le trépied d'argile d'un poêle a trois largeurs de doigt de haut, il contracte les impuretés par contact et à travers son espace aérien. S'il est plus bas, il contracte d'autant plus l'impureté, même si [ses étais] étaient au nombre de quatre.
Bartenura on Mishnah Kelim
היתה מופרשת – that the artisan did not build from the outset the court/fender[of the stove] and the portable stove with caves for two pots being attached together, but rather, the one is on its own and the other is on its own.
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English Explanation of Mishnah Kelim
If it [the extension] was detached from the stove, whenever it was three fingerbreadths high it contracts impurity by contact and through its air-space, If it was lower or if it was smooth it is clean. If the extension that surrounds the stove was not attached to the stove, it is susceptible to impurity only if it is three fingerbreadths high. This means that if the stove contracts impurity through its airspace or by contact, the extension will also be impure. If, however, the extension was less than three fingerbreadths high, or it had no rim (it was smooth), then it is considered separate from the stove and if the stove becomes defiled the extension remains pure.
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Bartenura on Mishnah Kelim
חלקה (smooth) – without a receptacle at all. It is taught this, but you don’t have to mention that.
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English Explanation of Mishnah Kelim
If three props on a stove were three fingerbreadths high, they contract impurity by contact and through their air-space. If they were lower, all the more so they contract impurity, even where they were four in number. Some commentators explain that the three props form a tri-pod for the pot to rest on the stove, while others explain them as serving as a base for the stove itself. If they are no more than three fingerbreadths above the stove, then they are considered part of the stove and the impurity of the stove contracted either by contact or through its airspace will similarly defile the props. If the props are closer to the stove, they are all the more so susceptible to impurity. This is true even if there were four of them, meaning that one was superfluous. However, if there were five or more props, they are not considered to be part of the stove and if the stove is defiled the props remain clean.
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Bartenura on Mishnah Kelim
פטפוטי כירה (clay pins forming a sort of tripod for the double stove) – the feet of the portable stove with caves for two pots, which are three feet, and they are three fingers high, and they are considered like the double stove, and become susceptible to [ritual] defilement through contact and through airspace like the double stove itself. And all the more so if they are less than three fingers, they are judged like the portable stove with caves for two pots/כירה.
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Bartenura on Mishnah Kelim
ואפילו הן ארבעה – [four] feet. They are judged lie the portable stove with caves for two pots.