The Submarine of 1776 13 The Best-known Picture of Bushnell’s _Turtle_ 16 Another Idea of Bushnell’s _Turtle_ 19 Ezra Lee 21 The _Nautilus_ Invented by Robert Fulton 28 Destruction of the _Dorothea_ 33 Views of a Confederate _David_ 37 C. S. S. _Hundley_ 38 Cross-section of a Whitehead Torpedo 51 Davis Gun-torpedo After Discharge, Showing Eight-inch Gun Forward of Air-flask 53 Effect of Davis Gun-torpedo on a Specially-constructed Target 54 The _Intelligent Whale_ 58 _Le Plongeur_ 59 Steam Submarine _Nordenfeldt II_, at Constantinople, 1887 62 Bauer’s Submarine Concert, Cronstadt Harbor, 1855 65 Apostoloff’s Proposed Submarine 67 The _Holland No. 1_ 70 The _Fenian Ram_ 73 U. S. S. _Holland_, in Drydock with the Russian Battleship _Retvizan_ 77 John P. Holland 80 Lake 1893 Design as Submitted to the U. S. Navy Department 83 The _Argonaut Junior_ 84 _Argonaut_ as Originally Built 87 _Argonaut_ as Rebuilt 90 The Rebuilt _Argonaut_, Showing Pipe-masts and Ship-shaped Superstructure 93 Cross-section of Diving-compartment on a Lake Submarine 94 Cross-section of the _Protector_ 97 Mr. Simon Lake 98 U. S. Submarine _E-2_ 101 A Submarine Cruiser, or Fleet Submarine (Lake Type) 105 Auxiliary Switchboard and Electric Cook-stove, in a U. S. Submarine 107 Forward Deck of a U. S. Submarine, in Cruising Trim 109 Same, Preparing to Submerge 110 Depth-control Station, U. S. Submarine 113 Cross-section of a Periscope 114 Forward Torpedo-compartment, U. S. Submarine 117 Fessenden Oscillator Outside the Hull of a Ship 120