The gondolier stands on a poppa at the stern with his face towards the bow, and propels the gondola with a single oar. [Please select]
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Montagu says that it propels itself by its feet alone; Audubon, on the contrary, states that it uses the wings under water. [Please select]
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The force A is resolved into forces B and C, of which C propels the boat on the line of its axis. [Please select]
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So the air compressed by the wing in the downward stroke escapes backward, and in doing so propels the bird forward. [Please select]
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However, his greatest strength and skill are shown in swimming under water, where he propels himself with his wings, often to a considerable distance, either with or against the current. [Please select]
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