An Airplane View of the U. S. S. _Langley_ 165 A Map of the Port of New York 169 A Map of the Port of Liverpool 171 A Map of the Port of Rio de Janeiro 173 A Map of the Port of Cape Town 175 A Map of the Port of Marseilles 177 A Tug Boat 179 A New York Harbour Ferry 181 A New York Harbour Lighter 183 A Mississippi River Stern-wheeler 185 A Modern Venetian Cargo Boat 187 A Page of Knots in Common Use 193 Bearings and Points of Sailing 195 How a Fore-and-Aft Sail Is Reefed 197 A Freighter Tied Up to a Pier 199 A Few Types of Sailing Ships Common in European and American Waters 201 A Few Types of Sailing Boats to Be Found Around the World 203 The Rigging of a Three-masted Ship 209 The Sails of a Four-masted Ship 213 Using a Cross Staff 217 Using an Astrolabe 221 A Sextant in Use, and a Ship’s Log 225 Using a Pelorus 229 Sounding by Machine 233 The Pharos at Alexandria 237 The Tillamook Rock Light Station 239 Cape Race Lighthouse 241 Minot’s Ledge Light 243 Bishop Rock Lighthouse 245 Fire Island Lightship 247 Automatic Buoys 249 A Ship on the Ways 253 A Floating Dry Dock 255 The _Olympic_ 259 The _Aquitania_ 263 The _Paris_ 265 The _Spray_ 281 The _Detroit_ 283 A Reconstruction of One of Caligula’s Galleys 284