Anti-Invasion Floating Mortar
- Anti-Invasion Floating Mortar
Also known as Naysmyth's Submarine Mortar and the Steam Ram, the Anti-Invasion Floating Hammer was a semi-submersible naval ship conceived and published by inventor James Nasmyth in 1853. [Smiles, Samuel, ed., "James Nasmyth Engineer: An Autobiography". John Murray, 1912] The mortar had a length of 80 feet and a beam of 30 feet and was equipped with a small steam engine that drove a single propeller. The walls of the mortar were 10 feet thick, protecting it against potential enemy gunfire of that period. [Jackson, G. Gibbard. "The Romance of the Submarine". Philadelphia: J.B. Lippincott Company, 1930.] At the front of the boat was a hollow brass cap shaped like a ram that was 9 feet thick. Inside the ram was a case filled with a heavy charge of explosive powder. With only the funnel and a domed structure covering the pilot being visible above water, the mortar sought to attack enemy ships by ramming the hull with the explosive-filled ram. Because of potential dangers associated with its means of attack, the Anti-Invasion Floating Mortar was never built.
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