The newest type of submarine torpedo is 100 per cent efficient.

Understanding how this type of submarine flow evolves is a significant problem, because they are extremely difficult to monitor directly.

You happen to command a type of submarine torpedo boat in which all the world is at present much interested.

During these days David Pollard, the inventor who had made this splendid type of submarine boat possible, did not appear.

The highest type of submarine has a submerged tonnage of 812 tons and its length is 176 feet.

Mr. Pollard, when your type of submarine diving torpedo boat is understood by the United States Government you'll need some reliable and intelligent experts.

Besides, they have a certain type of submarine which they think is the best ever invented, and they would hardly change at this late day.

That is the principal improvement in the Advance over other types of submarines.

There are many types of submarines, some comparatively simple and small, and others large and complex.

Germany has developed the highest type of submarines, which she has used to the fullest advantage.

The makers of other types of submarine boats are green with jealousy of us, just now.

"You're building a type of submarine so simple that any child can handle it above or below water."