Transcriber’s Notes: Underscores “_” before and after a word or phrase indicate _italics_ in the original text. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Typographical and punctuation errors have been silently corrected. [Illustration] [Illustration] TRI-NITRO-GLYCERIN, AS APPLIED IN THE _Hoosac Tunnel, Submarine Blasting,_ ETC., ETC., ETC. BY GEO. M. MOWBRAY, NORTH ADAMS, MASS. 1872. NORTH ADAMS: JAMES T. ROBINSON & SON, PRINTERS AND BINDERS, TRANSCRIPT OFFICE, Transcript Building, Bank Street. 1872. Entered according to Act of Congress, in the year 1872, by GEORGE M. MOWBRAY, In the Clerk’s Office of the District Court of the District of Massachusetts. DEDICATION. TO WALTER SHANLY, M. P. Indebted to you for the resources which have enabled me to investigate the properties of Nitro-Glycerin, and render its manufacture a commercial success, permit me to dedicate the following pages in token of my appreciation of the indomitable energy, admirable organization, integrity of purpose, and engineering talent which have rescued the Hoosac Tunnel from the mire of politics and rendered it an engineering success; notwithstanding extraordinary impediments of flood, water fissures, strikes, jealousy and indifference on the part of those chiefly interested, that must have been most disheartening to your mind, and challenged a resolution and resources seldom combined with the abilities you have shewn in this work. Our relations during the past three years having been without a ripple, render this, my simple duty, an agreeable task. GEO. M. MOWBRAY. PREFACE.