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Countersunk   Listen
verb
Countersunk  past part., adj.  
1.
Chamfered at the top; said of a hole.
2.
Sunk into a chamfer; as, a countersunk bolt.
3.
Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.





Collaborative International Dictionary of English 0.48


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"Countersunk" Quotes from Famous Books



... describe a test for nitro-cellulose that has been in use in the Prussian testing station for some years. The apparatus consists of a closed copper bath provided with a condenser and 10 countersunk tubes of 20 cm. length. By boiling amyl-alcohol in the bath, the tubes can be kept at a constant temperature of 132 deg. C. The explosive to be tested is placed in a glass tube 35 cm. long and 2 cm. wide, having a ground neck into which an absorption bulb is fitted. The whole apparatus ...
— Nitro-Explosives: A Practical Treatise • P. Gerald Sanford
... building. As the door had slipped aside I had noted its great thickness, fully twenty feet, and as it reached its place once more after closing behind us, great cylinders of steel had dropped from the ceiling behind it and fitted their lower ends into apertures countersunk in the floor. ...
— A Princess of Mars • Edgar Rice Burroughs


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