Definitions
from The Century Dictionary.
- Having two ports which open simultaneously so as to give a large opening with small motion: said of engine-valves.
Etymologies
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Examples
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Even the cabinets themselves are designed for optimum sound with a double-ported floor that helps to enhance bass and a top cabinet placement for the woofer that helps to reduce distortion.
Big sound, little speakers: Nano technology moves to music 2007
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The cylinders of the main engines are 22 in., 36 in., and 57 in. in diameter respectively, with a piston stroke of 3 ft. The high-pressure cylinders are each fitted with a piston valve, and the intermediate and low-pressure cylinders with double-ported slide valves, all of which are worked by the usual double eccentric and link motion valve gear, by which the cut-off can be varied as required.
Scientific American Supplement No. 819, September 12, 1891 Various
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