288. Morse Transmitting Plate 562 289. Step-by-step Movement 567 290. Froment’s Dials 567 291. Wheatstone’s Universal Dial Telegraph 568 292. Mirror Galvanometer 571 293. Telegraph Post and Insulators 573 294. Ditto 573 295. Wire Circuit 574 296. Wire and Earth Circuit 574 297. Submarine Cable 575 298. Making Wire for Atlantic Cable 577 299. Instrument Room at Valentia 578 300. Breaking of the Cable 579 301. Atlantic Telegraph Cable, 1866 580 302. Diagram 580 302_a_. Reiss’s Musical Telephone 584 302_b_. Bell’s Musical Telephone 585 302_c_. Superposition of Currents 587 302_d_. Bell’s Speaking Telephone 588 302_e_. Hughes’s Microphone 591 Lighthouse (heading) 593 303. Eddystone Lighthouse 594 304. Eddystone in a Storm 595 305. Revolving Light Apparatus 601 306. Stephenson’s Holophotal Light 604 307. Camera 607 308. Camera and Slide 615 309. Folding Camera 616 310. Lenses 617 311. Bath 619 311_a_. The Roll-Slide 622 312. Portrait of Aloysius Senefelder 632 313. Press for Stereotyping by Clay Process 633 313_a_. The Linotype Machine 645 313_b_. A Matrix 646 313_c_. Diagram of Movements 647 313_d_. A Line of Matrices 648 313_e_. A finished Line entering galley 649 313_f_. The Melting Pot and Mould Wheel 650 313_g_. The Finished Line 651