ILLUSTRATIONS.
Reading edition
PAGE.
I. Vignette.
II. Drilling machine at heading, a photograph taken in Tunnel by Magnesium light, 7,760 feet from West Portal.
III. Stereoscopic view. Twelve cans after an explosion, 18
IV. “ “ West End, Hoosac Tunnel, 28
V. “ “ East End, Hoosac Tunnel, 39
VI. “ “ Nitro-Glycerin factory, 43
VII. “ “ ““ interior of converting room, 46
VIII. “ “ Central shaft, Hoosac Tunnel, 50
IX. Miners ascending “ “ “ “ 58
X. Bursting of can, whilst conveying Nitro-Glycerin, Hoosac Tunnel, 66
XI. Sinking Central Shaft, Hoosac Tunnel, 74
XII. Profile of the Hoosac Mountain, shewing progress January 1, 1872, 80
XIII. "Stopeing out" enlargement, East End, 85
XIV. Driving bench work and dumping from heading, West End, 90
(Photographs taken by L. Daft, operating for Messrs. Thompson & Co., of Albany, the drawings by Assistant Engineers C. O. Wederkinch and G. Lunt, the wood-cuts by Andrew & Son, Boston.)