xiv TABLE OF CONTENTS. 



and the Efficiency of the Axe, 467. Brick and Stone : Increasing the Hard- 

 ness and Durability of Sandstone by Impregnating it with Silicate of 

 Alumina, 464. 

 (b.) CONSTRUCTIONS. 



Vessels: Construction of Steel Vessels to Resist Pressure, 493. Canals 

 and Rivers : Report on the Reclamation of the Alluvial Basin of the Mis- 

 sissippi River, 476 ; Hydraulics in tbe Adirondack Plateau, 478 ; the Thrust 

 of Embankments, 495; the Suez Canal, 511. Harbors and Docks: Pres- 

 ervation of Harbors and Roadsteads, 496; an Improved Dry Dock, 508. 

 Tunnels : the Channel Tunnel, 512. Mines : Gold-mining in the Philip- 

 pine Islands, 474. 



(C.) MOTORS. 



The Waves: Utilization of Waves as a Motor Power, 505. Steam: Casing 

 for Steam-pipes, etc., 473 ; Jesty's Anti-fouling Composition, 478; Prevent- 

 ing Incrustation in Steam-boilers, 487 ; Copper Lining for Steam-boilers, 

 487 ; the Evaporation of Water in Steam-boilers, 497 ; New Adaptation of 

 Screw Propulsion, 504 ; Consumption of Wood by Railways, 473. Road- 

 ways and Vehicles : Walker's Patent Rolling Cars, 468 ; the Adhesion of 

 Locomotives to Railway Tracks, 504; Electricity for the Head-light of 

 Locomotives, 512. Telegraphs : History of Duplex Telegraphy, 471. 

 Balloons : Balloon Voyage from Buffalo to New Jersey, 472 ; Disastrous 

 Trip of the Balloon "Zenith," 472; Successful Scientific Ballooning, 500; 

 Aerial Navigation, 502. Explosives: Apparatus for Recording Signals 

 Automatically, 470; Heat and Products of Gunpowder Explosions, 479; 

 Explosive Agents, 479 ; New Monster Cannon of England, 486 ; Electric 

 Fuses, 488 ; a Monster Blast, 508. Miscellaneous : New Carbonic Engine, 

 474 ; Liquid Carbonic Acid as a Motive Power, 506. 



(d.) MISCELLANEOUS. 



Improved Clock-work Governor, 469; Improvements in Miners' Safety- 

 lamps, 469; Inhalation of Oxygen Mixed with Air, by Divers, etc., 470; 

 New Speaking and Hearing Trumpet for Divers, 470; the Pyroleter, 482 ; 

 Cork as a Non-conductor of Heat, 485 ; Carbonic Acid for Extinguishing 

 Fires in Mines and on Ships, 498 ; the Proposed Flooding of the Sahara 

 Desert, 509. 



M. TECHNOLOGY (eclxxix) 513 



(a.) THE LIBERAL ARTS. 



Printing and Stamping: Stamping-ink, 513; Photostereotypy, 557. 

 Engraving and Lithographing : a New Process of Engraving on Cop- 

 per, 514 ; Slate for Engravers, 514 ; French Method of Engraving on Wood, 

 514. Writing : Xerography, a Manifold Writing and Printing Process, 

 513; Writing Pigments of Ancient Manuscripts, 516 ; to Restore Old Writ- 

 ing, 516; Red Marking-ink for Clothing, 518; Substitute for Ink, 519; a 

 Writing-machine, 546. Photographing : an Oil-lamp as a Substitute for 

 the Magnesium Lamp in Photography, 517; Composition for Non-actinic 

 (Amber-yellow) Glass, 517; Advances in Photography, 517. Modeling 

 and Casting : Improvement in the Manufacture of Stucco, 518 ; the Hard- 

 ening of Plaster of Paris, 519; Setting of Plaster of Paris, and Mixture of 



