Commentary for Eruvin 173:5

היתה זקופה צריך שיהא גובהה עשרה טפחים ורוחבה ו' טפחים ושני משהויין

it is necessary that its height<span class="x" onmousemove="('comment',' I.e., the length of the balcony (cf. prev. n.) .');">¹²</span> shall be ten handbreadths<span class="x" onmousemove="('comment',' The prescribed minimum height of a partition.');">¹³</span> and its width six handbreadths and two fractions.<span class="x" onmousemove="('comment',' So that by imagining one handbreadth and a fraction of the width on either side to be bent towards the wall there would still remain a width of four handbreadths facing that wall, while the air space of four handbreadths between the wall and the balcony would be reduced to (4 - 1 and a fraction =) less than three handbreadths which (by the law of labud) is disregarded, and the hole, four handbreadths by four, is now surrounded by the wall of the house on one side, a partition of four handbreadths wide on the opposite side, and two walls virtually four handbreadths wide on the other two sides. The three sides of the balcony, which are deemed to stretch downwards to the water, together with the wall of the house thus constitute a private domain through which the water from the sea may be carried up.');">¹⁴</span>

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