149. Inking Balls 306 150. Inking Roller 306 151. Diagram of Single Machine 308 152. Diagram of Perfecting Machine 309 153. Cowper’s Double Cylinder Machine 309 154. Tapes of Cowper’s Machine 310 155. Hopkinson and Cope’s Perfecting Machine 311 156. Section of Casting Apparatus 314 157. Diagram of the Walter Press 315 158. Hoe’s Type Revolving Cylinder Machine 317 159. Hoe’s “Railway” Machine 319 160. Napier’s Platen Machine 320 161. Roller for Printing Wall-Papers 322 162. Machine for Printing Paper-Hangings 323 163. Chain Testing Machine 324 164. Pascal’s Principle 325 165. Collar of Hydraulic Cylinder 326 166. Hydraulic Press 327 167. Section of Hydraulic Lift Graving Dock 331 168. Section of Column 332 169. Sir W. Armstrong’s Hydraulic Crane 335 170. Raising Tubes of Britannia Bridge 336 171. Press for Raising the Tubes 337 172. Head of Link-Bars 338 173. Apparatus to Prove Transmission of Pressure 339 174. Pneumatic Tubes and Carriages 340 175. Diagram of Tubes, &c. 342 176. Sending and Receiving Apparatus 343 177. Section of Receiving Apparatus 344 178. Sommeiller Boring Machines 349 179. Transit by Diligence over Mont Cenis 353 180. Burleigh Rock Drill on Tripod 356 181. The same on Movable Column 358 182. The same Mounted on Carriage 359 183. Diamond Drill Crown 360 184. Diamond Drill Machinery 363 185. Chart of the Channel Tunnel 367 186. Section of the Channel Tunnel 368 187. View of Dover 369 187_a_. Map of the St. Gothard Railway 372