Reference for Shabbat 15:4
כפאה על פיה שבעה ומשהו חייב שבעה ומחצה פטור
Raba said: Even if it is not six broad, he is [still] exempt. What is the reason? It is impossible for a piece of cane not to project above ten.<span class="x" onmousemove="('comment',' Since it is ten handbreadths high, it is impossible that the top and bottom canes of the circumference shall be absolutely even and straight, and so something must project above ten from ground level, which is a place of non-liability, not public ground. But in order to incur liability the whole of the article thrown must rest in public ground. ');"><sup>4</sup></span>
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