The vivid description of that battle which Mr. Coffin has given in the "Boys of '76," is doubtless due in a great measure to the stories of these pensioners, who often sat by the old fire-place in that farm-house and fought their battles over again to the intense delight of their white-haired auditor. Ill health, inability for prolonged mental application, shut out the future correspondent, to his great grief, from all thoughts of attempting a collegiate course. While incapacitated from mental or physical labor he obtained a surveyor's compass, and more for pastime than any thought of becoming a surveyor, he studied the elements of surveying. There were fewer civil engineers in the country in 1845 than now. It was a period when engineers were wanted--when the demand was greater than the supply, and anyone who had a smattering of engineering could find employment. Mr. Coffin accepted a position in the engineering corps of the Northern Railroad, and was subsequently employed on the Concord and Portsmouth, and Concord and Claremont Railroad. In 1846 he was married to Sallie R. Farmer of Boscawen. Not wishing to make civil engineering a profession for life he purchased a farm in his native town; but health gave way and he was forced to seek other pursuits. He early began to write articles for the Concord newspapers, and some of his fugitive political contributions were re-published in _Littell's Living Age_. Mr. Coffin's studies in engineering led him towards scientific culture. In 1849 he constructed the telegraph line between Harvard Observatory and Boston, by which uniform time was first given to the railroads leading from Boston. He had charge of the construction of the Telegraphic Fire Alarm in Boston, under the direction of Professor Moses G. Farmer, his brother-in-law, and gave the first alarm ever given by that system April 29, 1852. Mr. Coffin's tastes led him toward journalism. From 1850 to 1854 he was a constant contributor to the press, sending articles to the _Transcript_, the Boston _Journal, Congregationalist_, and New York _Tribune_. He was also a contributor to the _Student and Schoolmate_, a small magazine then conducted by Mr. Adams (Oliver Optic).