Repaired the other piece - That which was left by Jedaiah after he had repaired the wall opposite to his own house. Probably some of the principal people were obliged to repair those parts of the wall opposite to their own dwellings. Perhaps this was the case generally.
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.