Reference for Eruvin 5:24
אי קלשת הוי לה קורה הניטלת ברוח הכא נמי אי קלשת הויא לה חמתה מרובה מצילתה אלא על כרחך נעשית צילתה מרובה מחמתה הכא נמי ע"כ נעשו כשפודין של מתכת
if you [regard it as] planed, would not the beam be like one that can be carried away by the wind?<span class="x" onmousemove="('comment',' In consequence of which it could not be regarded as a proper beam conforming to the prescribed thickness and strength, V. Supra p. 7, n. 16.');"><sup>53</sup></span> Consequently you must [assume that beams in the conditions mentioned]<span class="x" onmousemove="('comment',' In view of their general thickness and strength.');"><sup>54</sup></span> are regarded as metal spits;<span class="x" onmousemove="('comment',' A thin one of which can carry as heavy a weight as a thicker one of wood.');"><sup>55</sup></span>