Tri-nitro-glycerine, as Applied in the Hoosac Tunnel, Submarine Blasting, etc., etc., etc.

Chapter 4: ILLUSTRATIONS.

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About This Book

This work surveys the adoption and field use of nitroglycerin as a high‑power blasting agent, opening with accounts of early accidents and engineers' reports. It presents submarine and terrestrial blasting case studies and examines the explosive's chemical properties alongside detailed manufacturing, storage, and purification procedures. It describes electrical firing methods, construction of detonators and exploders, common explosive mixtures, and summarizes patent disputes. Practical guidance for tunnel drilling and blasting operations, safety directions, contractor memoranda, accident summaries, and technical illustrations round out a practical manual intended for engineers, miners, and contractors.

ILLUSTRATIONS.

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.)