...The method consists in taking the right hand in both yours, turningit palm upwards, bending your head low over it, and saying with greatenergy and a violent propulsion of the breath, Ibata... 
Mary H. Kingsley 「Travels in West Africa」
...In the second half of the pressure—thatis, when they are passing from the vertical direction (,A) to extreme obliquity backwards (, C)—the effectof their action is to give propulsion to the body...
Édouard Cuyer 「Artistic Anatomy of Animals」
...This consists in swimming under water, usingthe wings or “flippers” for propulsion, the action ofthese limbs being practically the same as they wouldbe in flying...
George Murray Levick 「Antarctic Penguins」
...Thesegill-plates are at times used for propulsion...
Geo. H. Carpenter 「The Life-Story of Insects」
...Melvin Sturgis is a mechanical engineer employed byROCKETDYNE, Propulsion field laboratory—a division of North AmericanAviation, Inc...
Melvin Sturgis 「The Unprotected Species」
...“Scientists willcome through with something, somenew method of propulsion...
Various 「Astounding Stories of Super-Science, December 1930」
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