R. S. WOODWARD _facing_ 276 Perforated sails for ships 292 Edison phonograph 312 TELEGRAPHONE 314 _and facing_ 314 GRAY TELAUTOGRAPH 315 _and facing_ 318 Hussey’s mower or reaper 321 Mergenthaler linotype, justifying wedges 323 Schuckers’ double-wedge justifier 324 Two wedges partly in contact, and fully in contact 325 Polarized light shows strains in glass 327 Stop-motion 330 Dexter feeding mechanism 331 Schumann’s “Traumerei” in musical score and on Pianola roll 334 Mechanism of Pianola 335 AUTOMATIC TELEPHONE 336 _and facing_ 336 Blenkinsop’s locomotive, 1811 345 Notes on loose cards in alphabetical order 350 Sectional bookcase, desk and drawers 351 Burke telegraphic code 353 Burke simplified telegraphic signals 354 Pupin long-distance telephony 367 Water-gauge direct and reversed 370 THOMAS ALVA EDISON _facing_ 374 Cube-root extractor 376 Square-root extractor 377 Sturtevant ventilating and heating apparatus 380 Bicycle suspended from axle 382 Telephones receiving sound through a beam of light 395 Selenium cylinder with reflector 398 Perforated disc yielding sound from light 399 SIR HENRY BESSEMER _facing_ 402 First Bessemer converter and ladle 406 New Ingersoll coal cutter 418 Drill steels 418 SCULPTOR AT WORK WITH PNEUMATIC CHISEL _facing_ 418 Haeseler air-hammer 419 Rock drill used as hammer 420 Little Giant wood-boring machine 420 Water lifted by compressed air 421 Harris system of pumping by compressed air 422 Hardie nozzle for painting by compressed air 423