264. Electro-plating 499 265. A Current producing a Magnet 500 266. An Electro-magnet 501 267. Ruhmkorff’s Coil 503 268. Discharge through Rarefied Air 504 268_a_. Large Induction Coil at the Old Polytechnic 505 Institution, London 269. Appearance of Spark on Looking-glass 507 270. Magneto-electric Spark 508 271. A Magnet producing a Current 509 272. Clarke’s Magneto-electric Machine 509 273. Magneto-electric Light 510 274. Diagram 511 275. Gramme Machine 512 276. Insulated Coils 513 277. Hand Gramme Machine 513 278. Gramme Machine, with eight Vertical Electro-Magnets 516 279. Gramme Machine, with Horizontal Electro-magnets 517 280. Gramme Machine 519 280_a_. The Alliance Machine 520 280_b_. Wilde’s Machine 521 280_c_. Siemens’ Dynamo 522 280_d_. The Brush Dynamo 523 280_e_. Siemens’ Regulator 524 280_f_. Jablochkoff Candle 525 280_g_. Electric Lamp 526 280_h_. Incandescent Lamp 529 280_i_. Poles with Single Arms for Suburban Roads.—The 533 Ontario Beach Railway, Rochester, N.Y. 280_j_. The Glynde Telepherage Line, on the system of the 534 late Fleeming Jenkin 280_k_. Diagrams 540 280_l_. The Tesla Oscillator 542 280_m_. M. Nikola Tesla 543 281. Portrait of Professor Morse 547 282. Double-Needle Instrument 554 283. Electro-magnetic Bells 555 284. Portable Single-Needle Instrument 556 285. Connections of Telegraph Line 558 286. Morse Recording Telegraph 559 287. Morse Transmitting Key 561