Reference 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'.');">²⁵</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) .');">²⁸</span>

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