PYRAMID CUT

Domain	Definition
Mining	A. In tunnel driving or shaft sinking, a pattern of shotholes drilled so that the middle holes converge and outline a pyramid-shaped volume of rock. These holes are fired first, and thus create a free face or relieving cut b. This cut has received its name from the shape of the initial opening. The three or four holes are so directed that they meet at a point farthest in. The pyramid cut is mainly employed in raises and for shaft sinking but is not recommended for horizontal tunnels where a machine setup for a definite direction of the four holes cannot easily be obtained. Syn:German cut c. This type of cut usually consists of four holes drilled to meet at a common apex in the center of the face. This arrangement permits a high concentration of explosive to be used, and the pyramid cut is therefore particularly suitable for breaking hard ground. In very hard ground the number of holes forming the cut may be increased to six. The main disadvantage of this type of cut is the difficulty in drilling the holes at the correct angles so that they will meet at the back of the cut. As in the case of the wedge cut, therefore, a hole director should be used. Also called diamond cut d. In underground blasting, a type of cut employed in which the three cut holes in the center may be drilled to form a pyramid. Also applied to four holes meeting in a point. The simultaneous firing of these holes is somewhat equivalent to using a very heavy charge of explosive and makes a powerful blast e. A cut in which four central holes are drilled towards a focal point,and when fired break out a tetrahedral section of strata. (references)
Source: compiled by the editor from various references; see credits.

Anagrams: PYRAMID CUT

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-c-d-i-m-p-r-t-u-y"
	-2 letters: dumpcart.
	-3 letters: crampit, crudity, daturic, diptyca, paucity, primacy, pyramid, raucity.
	-4 letters: acuity, adytum, armpit, atrium, atypic, crimpy, dictum, impact, impart, mudcap, mudcat, myriad, myrica, parity, piracy, purity, putrid, pyuria, radium, updart, uratic.
	-5 letters: acidy, acrid, admit, amity, atrip, audit, auric, caird, campi, campy, caput, carpi, cramp, crimp, crump, crypt, cupid, curdy, curia, cymar, dairy.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.