Exodus 27:4

And thou shalt make for it a grate of network of brass, and upon the network four brass rings upon its four corners.

מכבר, a netting; compare Amos 9,9 כאשר יגוע בכברה ולא יפול צרור ארץ, “as one shakes in a sieve and not a pebble falls to the ground.”

ועשית על הרשת, “you will construct on that network, etc.;” these rings were meant to enable the Levites to insert the staves into by which the altar would be transported, carried by the Levites. Rabbi Yechiel, pointing to a statement in the Talmud, tractate Shabbat, folio 92, raised the problem that according to the Talmud, anyone carrying a load at a level of higher than ten handbreadths (on the Sabbath) should be guilty of having committed a violation seeing that the sons of Kehat who carried the Holy Ark on their shoulders, certainly carried it more than ten handbreadths above ground level. The Talmud there proves that the rings through which the staves for carrying the Tabernacle’s furnishings were carried were attached at two thirds of the height of the respective holy vessel. The height of the Levites supposedly was eighteen handbreadths including their respective heads. It follows that anything they carried on their shoulders was already much higher than that. [Rabbi Yechiel did not refer to the Levites being guilty of carrying something in the desert, seeing that the Israelites, of course, did not travel in the desert on the Sabbath. What he questioned was that the public domain is never considered as being more than ten handbreadths above ground level, so that anyone carrying a load on the Sabbath at a level higher than ten handbreadths cannot be culpable for violating the Sabbath. Seeing that the Levites carried loads at a higher level than that, and the desert where the Israelites were was certainly considered a public domain, how could our sages have restricted the concept of “public domain” to as little as ten handbreadths above ground level. Ed.] In light of all the above, how could the Talmud have derived the limitation of the height of the concept “public domain” by using the altar as its example? The Levites’ shoulders were fifteen handbreadths high, and the part of the altar that stuck out beyond their heads was way beyond ten handbreadths above ground. We would have to say that the Talmud’s statement is to be taken as proof that the rings fastened to the network were at a level lower than two thirds of the altar and that only the upper third was above the rings, or at least no more than half its height. If so, the rule that the public domain does not extend beyond a height of then handbreadths can be used for the Sabbath, the level of the network of the altar serving as proof.