Talmud for Eruvin 1:2

MISHNAH: A sukkah which is higher than twenty cubits is disqualified; Rebbi Jehudah qualifies it¹Since the essence of a sukkah is its roofing, סְכָךְ, which has to be temporary and made from vegetable material, giving little protection from the rain, the roofing always should be visible to any person inside the sukkah.. It is disqualified if it is not ten hand-breadths high²Since nobody could dwell inside., or does not have three walls³Even though Isaias (Is. 1:8) gives the name of sukkah to a watchman’s shelter from the sun, a roof over 4 poles without any walls, this does not apply to the holiday hut which must be a dwelling place., or where the sunshine is larger than the shade.

A wall, and a tree, and a copse of reeds are counted as double columns⁴⁵Babli 15a, 19b, Šabbat 24b.. If they grew by themselves one may carry there up to an area of two bet se’ah. If he planted them with his hands one may carry there even one or two bet kor⁴⁶Chapter 1, Note 288.. If there was one large well and he made [the double columns] for one half but not for the other half. For the half for which he made it it is permitted, for the half for which he did not make it it is forbidden. If there were two, could the space in-between be considered for both sides? What is his problem? If both were used to fill; but if only one was used to fill it is usable for both sides⁴⁷If separate symbolic enclosures were made for two adjacent wells and one set of double columns serves for both enclosures, it is clear that one may not simultaneously draw water from both wells since this would use the middle double pillars in two contradictory ways. (This implies that they were double, not triple, i. e., shaped like a Γ but not a Τ.) But if at one time only one well is used, the next time the other well may be used, even on the same Sabbath..