What was the copper Michbar? What purpose did it serve?
Rashi: It was an ornamental netting that surrounded the Mizbe'ach 1 underneath the Karkov; 2 the bottom of the network served as the halfway mark, 3 and it was on it that the four rings that housed the poles were fixed.
Targum Yonasan: The netting caught any limbs that fell of the Mizbe'ach, which the Kohanim would retrieve and re-place on the Mizbe'ach.
Rashi (verse 1) writes that one opinion holds that the Mizbe'ach was ten Amos tall, bearing in mind that the rings for the poles were fitted on the Michbar, five Amos from the ground, how did the Levi'im carry it?
Shabbos (92a): The Levi'im were all ten Amos tall.
Rashi (Shabbos 92a): Even if the Leviyim were only about seven Amos tall, they could carry it properly.
The verse says that the rings that housed the poles to carry the Mizbe'ach were on the Reshes, which was until half the Mizbe'ach's height (verse 5). It says in Shabbos (92a) that the people who carry on staves, a third of the load is above their shoulders! (Bnei Kehas carried the Mizbe'ach on [poles on] their shoulders - Bamidbar 4:13,15, 7:9)!
Moshav Zekenim (25:12): The rings had a big gap. 1 The top of the gap was at two thirds of the Mizbe'ach's height, so only this amount was carried above their shoulders.
Da'as Zekenim: The Gemara proved that it was carried at least 10 Tefachim above the ground if it was carried normally, and all the more so it was above 10 since the rings were in the middle!
Rashi says that the Reshes was an Amah wide. According to the opinion that the Mizbe'ach was three Amos tall, two thirds of its height was a half Amah above the middle, in the middle of the rings were attached towards the top of the Reshes, , which was until half the Mizbe'ach's Moshav Zekenim (25:12) said that it is normal to carry a third, i.e. of the weight, above the shoulder. Perhaps the bottom half of the Mizbe'ach contained two thirds of the weight. 2 (PF)
Da'as Zekenim: If not that people normally carry a third above the poles, one could have said that the rings had a big gap, and the bottom of the Mizbe'ach was within 10 of the ground.
Even though the base of the Mizbe'ach was wider (five Amos, with the Yesod) than the rest of the Mizbe'ach (three), this calculation would require that it was denser on bottom than on top, in order to we would not Amos tall, this is very reasonable. The total area of the side walls, excluding and corners, was 38 [square Amos]; 18 was above the rings, and 18 below. The area of the base was 25. side walls, excluding the base and corners, and , Even though the bottom of the Mizbe'ach with the Yesod was five Amos wife, and above this it was only three Amos wide, was