This projectile, along
with a corresponding rifled cannon, was invented by Lieutenant Colonel Richard Delafield
for the State of New York. A schematic drawing Delafield prepared of his cannon is
dated September 11, 1861. Thirteen of the Delafield cannon were delivered to the
Commissary General of the State of New York on March 18, 1862. The base of this
projectile has five cast raised flanges that correspond to the Delafield cannon's rifling.
This specimen is similar in appearance to the Federal 20-pounder Parrott
projectile. There have been no known combat finds, and battlefield use is unlikely.
