Reference for Shabbat 196:11
ת"ר חרוצים היו קרשים וחלולים היו האדנים
this was to cover the cubit of the sockets: that is R. Judah's view. R. Nehemiah said: It was to cover the cubit of the boards.<span class="x" onmousemove="('comment',' Left uncovered by the first covering. v. supra. ');"><sup>19</sup></span> Cast their breadth over the length of the Tabernacle: how much was it? Forty-four [cubits]. Subtract thirty for the roof leaves fourteen. Subtract two for the doubling over, as it is written, and thou shalt double over the sixth curtain in the forefront of the tent,<span class="x" onmousemove="('comment',' Ex. XXVI, 9. ');"><sup>20</sup></span> leaves twelve. Now, according to R. Judah, it is well; thus it is written, the half curtain that remaineth shall hang;<span class="x" onmousemove="('comment',' Since R. Judah requires only a fingerbreadth for the top thickness of the board, practically two cubits-i.e., half a curtain hung, i.e., trailed on the floor. ');"><sup>21</sup></span> but according to R. Nehemiah, what is meant by [the half curtain …] shall hang?<span class="x" onmousemove="('comment',' only one cubit was left over, the other being required for the thickness. ');"><sup>22</sup></span> — It shall hang over its companions.<span class="x" onmousemove="('comment',' Sc. the lower covering, beyond which the upper fell two cubits. ');"><sup>23</sup></span> The School of R. Ishmael taught: What did the Tabernacle resemble? A woman who goes in the street and her skirts trail after her.<span class="x" onmousemove="('comment',' On the ground. So did the Tabernacle's covering trail too. ');"><sup>24</sup></span> Our Rabbis taught: The boards were cut out and the sockets were grooved;<span class="x" onmousemove="('comment',' So that the former fitted into the latter. ');"><sup>25</sup></span>