Reference for Shabbat 196:5

(שמות כו, כח) והבריח התיכון בתוך הקרשים תנא בנס היה עומד

But on the view that they were a cubit thick at the bottom, while they tapered at the top to a fingerbreadth, one receded and the other protruded?<span class="x" onmousemove="('comment',' Obviously these two side boards protruded at the top beyond the attenuated thickness of the boards ranged lengthwise. — 'one receded' refers to the latter. ');">⁸</span> They were planed mountain-fashion.<span class="x" onmousemove="('comment',' These two boards were wider at the bottom and narrower at the top so that their outward line resembled a mountain slope. 'Aruch reads: like a gusset (ki tariz). ');">⁹</span>

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