Commentary for Exodus 27:14

עמדיהם שלשה THEIR COLUMNS THREE — There were five cubits space between one column and another column: between the column at the end of the southern row, standing at the southeast corner, to the first column which was one of the three in the east there were five cubits; from that to the second, five cubits, and from the second to the third, five cubits. It was similar at the other side of the entrance. And four columns for the screen are mentioned here, so that you have ten columns for the east corresponding to the ten columns in the west side (v. 12).

וחמש עשרה אמה קלעים לכתף, in the easterly direction of the courtyards, an area that was 50 cubits wide. Allowing for the width of the Tabernacle of 20 cubits, this left 15 cubits of empty space on either side between the structure and the curtains enclosing the courtyard. It follows that a width of 50 cubits was enclosed in the sense that outsiders could not look beyond these curtains. [according to several opinions (both in Eyruvin 2 and in Zevachim) the measurement given here for the height of the curtains, i.e. 5 cubits, refers only to the height over and above the height of the copper altar, which itself was 10 cubits, so that the overall height of these curtains was 15 cubits. Ed.]

V. 14. כתף ,לכתף, vom Schulterblatt hergenommen, bezeichnet die zu beiden Seiten der Türe die Vorderseite deckende Wandung. Der Hof war fünfzig Ellen breit, davon deckten die fünfzehn Ellen breiten beiden Seitenstücke dreißig Ellen, blieb also ein Eingang von zwanzig Ellen.