Vacuum renovators for carpets and upholstery 424 Injector sand-blast, Drucklieb’s 425 Vertical receiver, inter- and outer-cooler 426 Concrete silo foundation 431 Concrete silo 432 MANSION IN CONCRETE, FORT THOMAS, KENTUCKY _facing_ 432 Wall of two-piece concrete blocks 434 Ransome bar for concrete 436 Corrugated steel bar 436 Thacher bar 436 Kahn bar 437 Hennebique armored concrete girder 437 Monier netting 437 Expanded metal diamond lath 438 Tree box in expanded steel 438 ROYAL BANK OF CANADA, HAVANA _facing_ 438 Lock-woven wire fabric 439 Column forms for concrete, Ingalls Building, Cincinnati 440 Section of chimney, Los Angeles, Cal. 441 Coignet netting and hook 442 Section of conduit, Newark, N. J. 442 Water culvert 443 River des Pêres Bridge, Forest Park, St. Louis 444 Memorial Bridge, Washington, D. C. 444 Francis vertical turbine wheel 446 5000 HORSE-POWER ALLIS-CHALMERS STEAM ENGINE _facing_ 448 Smoke-jack 449 POWER HOUSE, INTERBOROUGH CO., NEW YORK, exterior _facing_ 450 Schmidt superheater 451 POWER HOUSE, INTERBOROUGH CO., NEW YORK, interior _facing_ 452 De Laval steam turbine, sections 453 WESTINGHOUSE-PARSONS STEAM TURBINE _facing_ 454 Combustible gas from a candle 458 Taylor gas-producer 460 Four-cycle gas engine 463 Fire syringe 467 Sturtevant fan wheel, without casing 472 Sturtevant Monogram exhauster and solid base heater 473 NEW YORK CENTRAL R. R. ELECTRIC LOCOMOTIVE WITH FIVE-CAR TRAIN _facing_ 476 ACKNOWLEDGMENTS