xvi TABLE OF CONTENTS. 



ENGINEERING- Continued. 



The In dbr-oceanic Canai Page 573 



\ Railway across Newfoundland 574 



I'm. Capk Cod Sinr-cANAi 575 



Delaware and Maryland Shd?-canai 575 



'I'm: [mpROVEMENT of CHARLESTON HARBOR 577 



Improvements on the Kanawha 577 



High-level Street-railways of New York 577 



Tin: Madeira and Mamore* Railroad 578 



Proje< ii i > Draining op the Zuyder-Zee 578 



ST. GoTHARD TUNNEL '. 580 



A Deep Ska IIauuor for the Port of Boulogne 580 



Tim: ( 'iiannel-tunnel Project , 580 



Brddoing the Firth of Forth 581 



A Railway Bridge across the Tay, at Dundee 58L 



'I'm; Railway Bridge over the Duoro River 581 



An Underground Railway for Paris 582 



Steam-heating for Cities and Towns .">*:_> 



I' rn.izA iion or Solar Heat 583 



Steam Road-wagons 583 



TECHNOLOGY. By William H. Wahl, Ph.D., Philadelphia, Pa 585 



Comparative Merits of Dynamo-electric Machines 585 



Telegraphy 58G 



The Electric Light 588 



The Fuel of the Future 591 



( j as-engines 594 



The Incrustations on Brick Walls 59-4 



i ridescent glass 595 



Artii - k ial Production of Corundum Gems 590 



The Ammonia Process of Soda Manufacture 597 



Lamp-black from Natural Gas 598 



\ i \v Caledonia Nickel 598 



Plating Metals by Galvanic Means 599 



Tin Protection of Iron Surfaces GO I 



Bala ta 601 



New Explosives 602 



INDU ST RIAL STATISTICS. By William FI. Wahl, Ph.D., Philadel- 

 phia, Pa 003 



General Revtew <>i the Iron Trade of the United States 



i < R 1877 003 



Production of Pig-iron in 1877 603 



A Comparative Tabulation of Pig-iron by States 605 



Prodi n<>\ <i Rolled Iron in is?7 605 



I'm i [on "i Pig-iron m States 000 



Km \i-hi i. \ iion and Analysis G00 



Condition of the Blast-furnaces of the United States, Octo- 

 ber 1. 1878 GOG 



