Exodus 30:2 - Clarke's commentary and critical notes on the Bible

A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be: and two cubits shall be the height thereof: the horns thereof shall be of the same. Four-square - That is, on the upper or under surface, as it showed four equal sides; but it was twice as high as it was broad, being twenty-one inches broad, and three feet six inches high. It was called, not only the altar of incense, but also the golden altar, Numbers 4:11. For the crown, horns, staves, etc., see on the altar of burnt-offering, Exodus 27:1 (note), etc.