Reference for Eruvin 173:6

אמר רב הונא בריה דרב יהושע היתה עומדת בקרן זוית צריך שיהא גובהה י' טפחים ורוחבה ב' טפחים ושני משהויין

R'Huna son of R'Joshua observed: If it<span class="x" onmousemove="('comment',' A balcony.');">¹⁵</span> was situated in a corner<span class="x" onmousemove="('comment',' So that two of its sides are formed by the walls of the house.');">¹⁶</span> it is necessary for its height to be ten handbreadths<span class="x" onmousemove="('comment',' The prescribed minimum height of a partition.');">¹⁷</span>

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