...These holidays are conductors or safety valves to carry off the explosive elements inseparable from the human mind, when reduced to the condition of slavery... 
Frederick Douglass 「My Bondage and My Freedom」
...Livingstone (1871) passed thirty smelting houses inone journey, and Cameron came across bellows with valves, andtribes who used knives in eating...
W.E.B. Du Bois 「The Negro」
... Body elongated, slender, in the male six-jointed, the last with two approximating incurved hooks; valves broad, thickened, truncate, and hooked...
William Swainson 「Zoological Illustrations, Volume I」
...The valves are subject to abnormal growths and structural changes in chronicendocarditis or as a result of acute endocarditis...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...These valves are intended to prevent the flow of blood in a direction contraryto that indicated by the arrows...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...On the convex surface of these objectsparallel lines are etched, and they are pierced at the valves for suspension...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...In this vessel are valves,accurately fitting over the upper vents of the pipes, which stop up theventholes, and keep what has been forced by pressure into the vesselfrom going down again...
Vitruvius 「Ten Books on Architecture」
...When the windchest has received the air, these valves will stop up theopenings, and prevent the wind from coming back again...
Vitruvius 「Ten Books on Architecture」
..."We'll know soon!" was the grim answer, as Prescott worked franticallynow with his valves and levers...
Various 「Astounding Stories, July, 1931」
...is gun playing about him, Asher raced toward the big valves and gatesthat shut off the drain of the pipe-lines...
Various 「Astounding Stories of Super-Science, June, 1930」
...The hissing of the pneumatic valves ofthe plate-shifters in the lower controlroom...
Various 「Astounding Stories of Super-Science April 1930」
...The valves were opening;the plates automatically shifting intoneutral...
Various 「Astounding Stories of Super-Science April 1930」
...And then, withthese simple valves, we let out a little of whichever wewish—release it a grain at a time, if that is best...
Charles Willard Diffin 「Two Thousand Miles Below」
...The sameresult would appear if we carried our ear toward the sound fastenough to take up twice as many valves as though we stood still...
Henry Warren 「Recreations in Astronomy」
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