Talmud for Eruvin 115:12
היה מודד והגיע: מדתני חוזר למידתו מכלל דאם אינו יכול להבליעו הולך למקום שיכול להבליעו ומבליעו וצופה כנגד מידתו וחוזר
IF IN THE COURSE OF MEASURING THE SURVEYOR REACHED. Since it was stated: RESUMES HIS MEASURING it may be inferred that if he is unable to span it<span class="x" onmousemove="('comment',' The GLEN, the WALL or the HILL where, for instance, the section that along the town is wider than fifty cubits.');"><sup>22</sup></span> he proceeds to a position<span class="x" onmousemove="('comment',' Away from the town.');"><sup>23</sup></span>
Jerusalem Talmud Eruvin
HALAKHAH: Paragraph. “One only measures with a rope of 50 cubits,” etc. How much is the measure of the Sabbath domain? 40 ropes. “Neither less” since it can be tightened and increases, “nor more” since it gets loose and loses116Babli 58 a.. Some Tannaim state, one measures with a linen rope, but some Tannaim state, with a chain rope117A metal chain., and some Tannaim state, with a rope of four cubits. 116Babli 58 a. Rebbi Joshua said, there is no truer measure than with chains, but what can I do since in Prophets it is written ropes, a linen twine was in his hand and a measuring rod118Ez. 40:3..
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