TABLE OF CONTENTS. XV 



INIethod of Making Malleable, 523 ; New Method, 537 ; Bar-iron from Phos- 

 phureted Cast Iron, 514 ; Rails : Production in the United States in 1872, 

 513. Wood : New Preservative of, 515 ; Preservation of Railroad Ties, 526 ; 

 Eucalyptus for Timber, 516. 

 (b.) CONSTRUCTION. 



Vessels : Protection of Ships against Torpedoes, 522 ; Detection of Leaks 

 in Ships, 537. Canals : United States Irrigation Commission in California, 

 511. Tunnels: Sutro Tunnel Commission, 516. Telegraphs: Injuries to 

 Cables by Marine Animals, 529 ; Entanglement of Whale in, 540. Build- 

 ings : "Water-proof Coating for Walls, 517 ; Treatment of New, Damp Dwell- 

 ing-rooms, 517 ; Proper Construction of Chimneys, 518 ; Acoustics of Large 

 Rooms, 519, 528. 



(C.) MOTORS. 



Coal : Desulphurizing Coke, 539. Electricity : The Gramme Electric Ma- 

 chine, 531. Gunpowder Pile-driver, 538. The Winds: Turbine Wind 

 Motor, 538. Steam-boilers : Experiments on Boiler Explosions, 520; Glyc- 

 erine as an Anti-incrustator, 520 ; Value of the Steam-jacket for Engines, 

 521; Casing for Boilers, 530: Siemens' Steam Motor, 537. Railroads 

 Roadway: Preservation of Railroad Ties, 527; Road in Nicaragua, 675 

 Equipment: Wendt's Torsion Car-spring, 521; Screw Railway Brake, 521 

 Westinghouse Air Brake, 532 ; Railway Master Mechanics' Association, 539. 

 Telegraphs : Optical Telegraphy, 161 ; see also Electricity, under Phys- 

 ics. Balloons: Scientific Balloon Ascension, 95, 96, 124; Long Voyage, 

 534. Aeronautics : Mechanical Principles of Flying, 534. Signals : Sig- 

 nal Lights, 540. Explosives : Explosion of Wet Gun-cotton, 522, 543 ; Im- 

 proved Gun-cotton, 543 ; Explosive Paper Cartridges, 535; Action of Dy- 

 namite, 535 ; Fire-proof Powder-chests, 610. 



M. TECHNOLOGY (cxxiv) 545 



(a.) THE LIBERAL ARTS. 



Printing and Stamping ; Inerasible Stamping-ink, 545 ; Blue Stamping- 

 ink, 546; Nickel-plated Type, 547. Engraving and Lithographing : Liq- 

 uid for Etching Copper, 548; Improvement in Photolithography, 611. 

 Writing : Red Indelible Ink, 545 ; Portable Ink, 546 ; Inerasible Writing- 

 ink, 546, 601. Drawing and Copying: Improved Tracing-paper, 545; 

 Drawing-ink, 546 ; Copying Designs, 601 ; Amsler's Planimeter, 612. Pho- 

 tographing : Gummate of Iron Photographic Paper, 574; Cotton for Col- 

 lodion, 574; Reducing Intensity of a Negative, 574 ; Persistent Activity of 

 a Bichromate Image, 575 ; Szekely's BriUiant Photographs, 576 ; Improve- 

 ment in Photolithography, 611. Modeling and Casting : Coating of Plas- 

 ter Casts, 576 ; Reproducing Art-models, 611; Phosphorus Bronze, 609 ; Al- 

 loys of Manganese, 613; Patina on Bronze, 548. Painting and Interior 

 Decoration : Material for Mouldings, 572. 



(b.) THE MECHANICAL AND CHEMICAL ARTS. 



Spinning, Weaving, and Felting : Improvement in Glass-spinning, 565 ; 

 International Standard for Numbering Yarn, 613; Treatment of Hair for 

 Felting, 549, 571. Sizing and Dressing : Improved Flour Paste, 550; Pres- 

 ervation of Teasel-cards, 603. Water-proofing of Fabrics, 575. Cleaning 

 and Bleaching : Removal of Oily Matters, 549 ; of Gum from Silk, 550 ; 

 Bisulphide of T^ime for Scouring Wool. 597 : Sulphates of Soda and Potash 



