18 And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.

19 And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.

20 And for the second side of the tabernacle on the north side there shall be twenty boards:

21 And their forty sockets of silver; two sockets under one board, and two sockets under another board.

Today we start to get the count of the boards. The tabernacle would have two long sides, which would face to the North and the South. They would each be comprised of 20 boards, each board was a cubit-and-a-half wide, so 30 cubits length in all, or approximately 45 feet.

The first layer of curtains we were told was to be made of ten parts, each four cubits wide, so forty cubits for the whole, which would be enough to cover the entire length of thirty cubits for the tabernacle and the ten cubits of height for the back wall. The second layer of curtains was made of eleven parts, so forty-four cubits for the whole, which would be enough to cover the top, the back, and have a little left over at the front to form a border around the entrance, as was described in those earlier verses.

Yesterday we also heard how each board would be forked into two tenons at the base, and today we hear that these would each be inserted into a double socket made of silver, providing a solid foundation for the structure.

Note: It can be difficult to visualize some of the structures described in these verses. Here is an excellent and extremely focused series of animations that show the visual form of the temple and its instruments, built up verse-by-verse from the Exodus record: https://youtube.com/playlist?list=PLpjohncRg94EZ55nJrbaKfi-lfeo3MFgl&si=6wm1J9Sdnu7LKYC_