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Updated: June 10, 2025
It must be admitted that the modern form of screw-propeller is quite unlike either of these original forms, although they all involve of course the same fundamental principles. Ericsson's propeller may properly be called an engineering success, built on sound principles, but improved and largely modified by the results of later experience and research.
At first two boats were ordered, later four others. For the turrets Eads submitted designs of his own, but as it was then only a month after the Monitor's fight, Ericsson's turrets were insisted on for the first two boats, although modifications were allowed.
Winslow and his friend Griswold, and said, in his inimitable manner, 'Well, I don't know much about ships, though I once contrived a canal-boat the model of which is down in the Patent Office the great merit of which was that it could run where there was no water. But I think there is something in this plan of Ericsson's. I'll tell you what I will do.
The original Monitor is 174 by 44-1/2 feet, with 5-inch side-armor, and a turret 8 inches thick, 20 feet in diameter inside, and armed with two 11-inch guns. These vessels of Ericsson's design are each in fact two vessels: a lower iron hull containing boilers and machinery, and an upper scow overhanging the ends and sides, forming the platform for the turret, and carrying the armor.
Then followed a series of remarkable pieces of work in which Ericsson's genius showed itself, either in original invention or in the adaptation and improvement of the existing facts and material of engineering practice. While thus occupied, his leave from his regiment expired, and he seems to have overlooked taking proper steps to have it renewed.
Winslow carefully read the papers and became satisfied that Ericsson's plan was both feasible and desirable. After conference with his friend and partner, Mr. Griswold, it was determined to take the whole matter to President Lincoln. Accordingly, an interview was arranged with Mr.
Next morning the Merrimac reappeared to complete her work of destruction. As she drew near the stranded Minnesota, a strange little craft moved out from the side of the big frigate and headed straight for the iron-clad. It was Ericsson's Monitor, which had arrived from New York at midnight.
This was displaced in the 'sixties and 'seventies by iron, which in turn was displaced by steel, so that at the present time, except for special reason, no material other than steel is thought of for this purpose. With the gradual displacement of wood by iron in the mercantile marine, Ericsson's relation was only indirect.
So long as the memory of naval warfare endures, Ericsson's name will be remembered for the part which he bore in the transition from wood to iron, from unarmored ships to turrets and armor, from scattered to concentrated energy of gun-fire, and for his general share in the developments which have led to the ideal of a battleship prevailing at the opening of the Twentieth century.
Ericsson's life falls most naturally into three periods chronologically or geographically, and likewise into three periods professionally, though the latter mode of subdivision has by no means the same boundaries as the former. The first mode of subdivision gives us the life in Sweden, the life in England, and the life in the United States.
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