"This invention relates to certain new and useful improvements in torpedo-boats; and it has for its objects, among others, to provide an improved device of this character designed to be self-propelling and to be propelled through the water without any occupant. I provide a gas-chamber which is preferably filled with scrap-iron and supported on the torpedo-boat proper, the latter carrying the motor and propelling means, and the torpedo or torpedoes which explode when coming into contact with an object, thus blowing up the object and the boat itself. Suitable means are provided for the guiding of the boat from the shore or other place from which it is propelled."