The V-3 was a German World War II large-caliber gun working on the multi-charge principle whereby secondary propellant charges are fired to add velocity to a projectile. Two full-size guns were built
The prototype V-3 cannon at Laatzig, Germany (now Zalesie, Poland) in 1942.
Remains of V-3 in Zalesie near Międzyzdroje, Wolin Island, Poland (2008)
Accelerating gun (1881) by James Richard Haskell
Accelerating gun by Lyman and Haskell (1883).
Project Babylon was a space gun project commissioned by then Iraqi president Saddam Hussein. It involved building a series of "superguns". The design was based on research from the 1960s Project HARP
V-3 cannon
…Cross-Channel guns in the Second World War Project Babylon Project HARP…
Two sections of Big Babylon that have been bolted together at Royal Armouries, Fort Nelson, Portsmouth.
A section of the Iraqi "supergun" from Imperial War Museum Duxford