"The Turin Gazette describes some experiments made I the Lake of Como with a submarine cannon invented by a son of the engineer Toselli. The gun was discharged at a depth of 100 metres, and the shell passed through an equal thickness of water in 10 seconds. The advantage consists in the gun being invisible to an enemy; and the object is, not to pierce an ironclad as a torpedo does, but to sink the hostile vessel, owing to the commotion produced by the explosion. A larger cannon is being constructed, under the inventors direction, to be tested at Spezzia in the presence of naval and military authorities."