Chapter II: Appendix

A. Memoranda for Contractors.
B. Over-sensitive Exploders.
C. Professor Abel on effects of initial explosion on explosives.
D. Car freighted with 4,800 lbs. Nitro-Glycerin off the track.
E. Accidents at the Hoosac Tunnel.

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.)