He also investigated there the laws of electric signals in submarine cables.
In the heroic years of his youth he had volunteered for the submarine service.
You will both have opportunities to see much of the officers of the Submarine Service.
It was the second submarine I saw on the night she foundered.
On the twenty-eighth of the month this submarine sank the liner Ethiope.
She was stopped and boarded off Malmoe by the crew of a German submarine.
She had withstood attack from a German submarine for four hours.
The submarine had heretofore been an untried form of war craft.
The body of this submarine is formed by a part of a broomstick or shovel-handle.
This submarine is truer to type and can be made with very little trouble.