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Updated: June 10, 2025
This was Ericsson's "cheese-box on a raft," named by him the Monitor. The Union officers who had witnessed the day's events with dismay, and were filled with gloomy forebodings for the morrow, while welcoming this providential reinforcement, were by no means reassured. The Monitor was only half the size of her antagonist, and had only two guns to the other's ten.
Besides inventing his own, he was also busy examining Ericsson's inventions, in making improvements on them, in applying steam in novel ways to the working of artillery and to the rotating and raising of turrets; in sending models of his inventions here and there, at home and abroad, to Germany, where the Prussian minister, a friend with whom he often dined, "wished they could get some of his boats on the Rhine;" having his turrets explained at a Russian dinner in New York or Washington; and receiving from the Navy Department an appointment as special agent to visit the navy yards in Europe.
This was Ericsson's so-called "Destroyer" system, and was embodied finally in a boat called the "Destroyer," which he built in company with his friend, Mr. C.H. Delamater, and with which he carried on numerous experiments.
In order to appreciate the influence of Ericsson's life and work on the field of marine construction, a brief glance may profitably be taken at this branch of engineering work as it was before Ericsson's time, and as it is now. The material employed for shipbuilding was almost entirely wood.
Alwin made a quick step forward to where the firelight revealed him to all in the room, and cried out hoarsely: "Here is falsehood! My hand, and no other, took Leif Ericsson's knife to the den of Skroppa the Witch." Motion and sound stopped for a moment, as though the icy blast, that came just then through the opening door, had frozen all the life in the room.
Ericsson's associates in the business of building monitors for the Government acquired these patents of Timby, presumably as shrewd business men, in order to quiet any claim on his part, and to have the plan available for land forts, should the opportunity arise to push the business in this direction.
Every change had to overcome the spirit of conservatism inherent in military organizations, where seniority rules, errors are sanctified by age, and every innovation upsets cherished routine. Thus in the contract for Ericsson's Monitor it was stipulated that she should have masts, spars, and sails!
At this point we see entering into Ericsson's life an idea which never left him, which controlled much of his work in mid-life, and which attracted no small part of his attention throughout his closing years. This idea was the discovery of some form of heat-engine which should be more economical than the steam-engine, especially as it was in his day.
F.P. Smith seems to have been drawn to the subject of the screw-propeller, and we find him taking out a patent for his form, consisting of an elongated helix or spiral of several turns, under date of May 31, 1836. Ericsson's patent followed some six weeks later, or on July 13, 1836.
On the very next morning there came into the mouth of the James the rival product of the Northern Navy Department and of the Swedish engineer Ericsson's invention. She was compared to a "cheesebox on a raft"; she was named the Monitor, and was the parent of a type of vessel so called which has been heard of much more recently.
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