Talmud for Eruvin 115:15
והא אנן תנן מבליעו וחוזר למידתו התם ניחא תשמישתא הכא לא ניחא תשמישתא
he is able to span it and, having spanned it, he makes the necessary observations<span class="x" onmousemove="('comment',' Lit., , 'and looks'.');"><sup>25</sup></span> [whereby he is enabled to locate the point on the far sides that is in a straight line with his original line of measuring] and then he resumes his measuring. If the glen was a crooked one<span class="x" onmousemove="('comment',' I.e., its narrow section (not exceeding fifty cubits) that could be spanned was not on that side of the town from which the sabbath limit was being measured (v. Rashi) .');"><sup>28</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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