The upgrades of the arsenal began in 1845-1854 with the construction of seven brand new workshops and the installation of 121 new machines. The new workshops had a brick superstructure with iron framing and sheet metal roofing. These reconstructed arsenal buildings became collectively known as the "U.S. Musket Factory". The armory canal was enlarged so that more water could get to the armory, which meant it would receive more power. 