In the year 1842, he formed a copartnership with Mr. A. Boody, and purchased from Mr. Howe his bridge patent for the New England States, including all improvements and renewals. Subsequently an arrangement was concluded with Mr. D. L. Harris, under the name of Boody, Stone & Co., for the purpose of contracting for the construction of railways, railway bridges, and similar work, the mechanical details generally to be under the charge of Mr. Stone. In the year 1845, Mr. Stone was appointed superintendent of the New Haven, Hartford and Springfield Railroad, he, however, still continuing his partnership in the firm of Boody, Stone & Co., and the business of the firm becoming so heavy that within a year from the time of his appointment he resigned his office as superintendent.
Circumstances occurred previous to his appointment that may be worthy of remark. The purchase of the bridge patent, before alluded to, was for the sum of forty thousand dollars, to be paid in annual instalments. A few years after the purchase some defects showed themselves in the bridges that had been erected on this plan, and many prominent engineers had come to the conclusion that it was not superior to, if it equalled, the truss plan of Col. Long, the arch and truss of Burr, or the lattice plan of Ithial Towne, and the firm of Boody, Stone & Co. began to fear that they had made a bad bargain in the purchase of the patent. Mr. Stone, in relating the incident to a friend, said: "I came to the conclusion that something must be done or there must be a failure, and it must not be a failure. The night following was a sleepless one, at least until three o'clock in the morning. I thought, and rolled and tumbled, until time and again I was almost exhausted in my inventive thoughts, and in despair, when at last an idea came to my mind that relieved me. I perfected it in my mind's eye, and then came to the conclusion that it would not only restore the reputation of the Howe bridge, but would prove to be a better combination of wood and iron for bridges than then existed, and could not and would not in principle be improved upon. Sleep immediately came. I afterwards, with models, proved my conclusions and have not, up to this time, changed them." It seems that the invention consisted in the introduction of longitudinal keys and clamps in the lower chords, to prevent their elongation, and iron socket bearings instead of wooden for the braces and bolts, to avoid compression and shrinkage of the timber, which was the great defect in the original invention, and the adoption of single instead of double intersection in the arrangement of the braces, the latter being the arrangement in the original invention.
In the autumn of 1846, an incident occurred that may be worthy of notice. On the 14th day of October, when walking in Broadway, New York, Mr. Stone met the president of the New Haven, Hartford and Springfield Railroad, who had in his hand a telegram, stating that the bridge across the Connecticut river at Enfield Falls, one-fourth of a mile long, had been carried away by a hurricane. The president asked the advice of Mr. Stone, who stated that the timber for that structure was furnished by Messrs. Campbell & Moody, of that city, and advised that he order it duplicated at once. The president, a very faithful officer, but disinclined to take responsibilities, asked Mr. Stone to take the responsibility of ordering it. Mr. Stone replied, "Not unless I am president." The timber was, however, ordered, and at the request of the president, Mr. Stone went immediately with him to Springfield, where a committee of the board was called together, and he was asked to propose terms, and the shortest time upon which his firm would contract to complete the bridge. He stated that his terms would be high, as the season was late and would likely be unfavorable before so heavy a work could be completed, and further suggested that if they chose to appoint him manager of the work, he would accept and do the best he could for them. He was immediately appointed sole manager of the work, and the board placed at his control all the resources of the company. The work was immediately commenced by bringing to the site men and material, and it was completed, and a locomotive and train of cars run across it by Mr. Stone within forty days from the day the order was given for its erection. The structure consisted of seven spans of seventy-seven feet each, with two other spans at each end of about fifty feet each. Mr. Stone has been heard to state that he regarded this as one of the most important events of his life, and that no one was more astonished than himself at the result. He was rewarded by complimentary resolutions, and a check for one thousand dollars by the company.
The following Winter the partnership of Boody, Stone & Co. was dissolved by mutual consent, and the territory that their contract for the bridge patent covered was divided, by Mr. Stone taking the States of Massachusetts, Connecticut and Rhode Island, and Mr. Boody the other three States. A new partnership was then formed between Mr. Stone and Mr. Harris, which continued until the year 1849.
From the year 1839 to 1850, the residence of Mr. Stone, most of the time, was in Springfield, Mass., but the numerous contracts in which he was interested called him into ten different States, He served several years as a director in the Agawam Bank, was also a director for several years, and one of the building committee in the Agawam Canal Company, which erected and run a cotton mill of ten thousand spindles, in the town of West Springfield.
In the autumn of 1848, he formed a partnership with Mr. Stillman Witt and Mr. Frederick Harbach, who contracted with the Cleveland, Columbus and Cincinnati Railroad Company to construct and equip the road from Cleveland to Columbus. This was the largest contract that had, at that time, been entered into, of this character, by any one party or firm in the United States. A large amount of the capital stock was taken in part payment for the work. It was generally regarded as a hazardous adventure, but the work was carried through in accordance with the terms of the contract, and proved to be a profitable investment for its stockholders. In his partnership contract it was stipulated that he was to act as financial agent at the East, to send out the necessary mechanics, and to occasionally visit the work, but was not to change his residence. Events, however, occurred that required his constant presence in Ohio, and in the Spring of 1850, he moved his family to Cleveland, where they have since resided. In the Winter of 1850-1, the road was opened for business through from Cleveland to Columbus, and Mr. Stone was appointed its superintendent.
[Illustration: Respectfully, Amasa Stone, Jr.]
In the Fall of 1850, the firm of Harbach, Stone & Witt contracted with the Cleveland, Painesville and Ashtabula Railroad Company to construct the railroad from Cleveland to the State line of Pennsylvania, and furnish it with cars, and to take in part payment for the work a large amount of the stock and bonds of the Company. Soon after the execution of this contract, Mr. Harbach died suddenly in the city of New York, and the completion of the work devolved on Messrs. Stone and Witt. The completion of the road through to Erie principally devolved upon the Cleveland company, and was attended with many difficulties, as the Legislature of Pennsylvania seemed determined that no road should be built through the State along the shore of Lake Erie, and the general impression was, at that time, that the construction of a road along the shore of the lake was a wild scheme and would prove a failure. It was difficult to get capital subscribed and more difficult to collect instalments. The contractors having confidence in its success, prosecuted the work with vigor up to a period when they found they had expended more than $200,000, while the aggregate amount that the railroad company was able to raise and pay them was less than $100,000. An effort was then made, with success, to engage the services of Mr. Alfred Kelley. His well known character, aided by the reputation of others who were elected directors, and a subscription from the city of Cleveland of $100,000, enabled the company to meet its engagements with the contractors, who carried the work forward to completion, and the road was opened through to Erie in the Winter of 1852, when Mr. Stone was appointed its superintendent. Notwithstanding the great expense that had to be incurred in crossing the deep ravines in the State of Pennsylvania, and the heavy burdens imposed on the company by that State, it has proved to be one of the most successful railroad enterprises in the United States.
In the year 1852, Mr. Stone was elected a director in both Cleveland, Columbus and Cincinnati, and the Cleveland, Painesville and Ashtabula Railroad Companies, and has held that office in both companies continuously up to the present date. He also continued to hold the office of superintendent of both roads until the year 1854, when he insisted on being relieved in consequence of failing health, caused by the arduous labors which seemed unavoidably to devolve upon him. He was elected president of the Cleveland, Painesville and Ashtabula Railroad Company in the year 1857, which office he has continued to hold for twelve successive years, until 1869.
In 1868, the Cleveland and Toledo Railroad was leased perpetually to the Cleveland, Painesville and Ashtabula Railroad Company, at which time he was also elected President of the former company.