Naval architect and engineer John Ericsson designed the "Passaic"-class warships, drawing upon lessons learned from the first , which he also designed. The "Passaic" monitors were larger than the original "Monitor" and had their pilothouses atop the turret, rather than near the bow. This allowed a wider field of view and easier communications between captain, pilot and crew. The shape of the hull was an improvement with a less pronounced overhang than "Monitor". The "Passaic" class featured an funnel and improved ventilation.