drill-hole pattern
drill-hole pattern
[′dril ‚hōl ‚pad·ərn] (engineering)
The number, position, angle, and depth of the shot holes forming the round in the face of a tunnel or sinking pit.
References in periodicals archive
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Tozzer found a Y arrangement in drill-hole patterns on a Navajo gourd rattle and concluded it represented the Hyades in Taurus, the Bull.
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