Just north of “Old Swede's” Church (PH33) is a rare survivor from the city's early industrial days. The tapering brick cylinder of Thomas Sparks's shot tower is where molten lead poured through a coarse sieve was formed into balls and cooled while falling from sufficient height into water. This six- (originally seven-) story tower continued to be used into the early twentieth century and is believed to be the first in the United States.