
The SciencesSeptember 25, 1915
Submarine for Hydrographic Work
Method of Discovering Dangerous Pinnacles in Rocky Bottoms

Submarine for Hydrographic Work
Method of Discovering Dangerous Pinnacles in Rocky Bottoms

Submarines That are Strictly Invisible
A Type That Can Pass Through a Mine Field and Attack a Blockaded Fleet

The Development of Submarine Boats—II
From Bushnell to Holland and Lake

The Development of Submarine Boats
From Bushnell to Holland and Lake

Safe Submarine Vessels and the Future of the Art