propulsion

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These two points were of the very essence of sailing tactics, and these two points have been eliminated from the modern tactical problem by the changes of propulsion and armament.
Monck Mason (whose voyage from Dover to Weilburg in the balloon, "Nassau," occasioned so much excitement in 1837,) conceived the idea of employing the principle of the Archimedean screw for the purpose of propulsion through the air - rightly attributing the failure of Mr.
Because of their steam propulsion, the American ships were larger and with a more graceful outline.
There was another little idiosyncrasy of design that escaped us both until she was about ready to launch--there was no method of propulsion.