The other piece - Rather, “another piece” (as in Nehemiah 3:19, Nehemiah 3:21, Nehemiah 3:27, Nehemiah 3:30). It is conjectured that a verse has fallen out in which Malchijah’s and Hashub’s “first piece” was mentioned.
The tower of the furnaces - Either a tower at the northwestern angle of the city; or, midway in the western wall. The origin of the name is uncertain.