A method of producing vertical blastholes by virtually burning holes in rock. Also known as piercing.


Related Terms

PISTON CORER

A steel tube which is driven into the sediment by a free fall and by lead attached to the upper end, and which is capable of recovering undistorted vertical sections of sediment.

PILASTER

A vertical rectangular architectural member that is structurally a pier and architecturally a column.

PETTIT TRUSS

A bridge truss in which the panel is subdivided by a short diagonal and a short vertical member, both intersecting the main diagonal at its midpoint.

PENDULUM SCALE

Weight-measurement device in which the load is balanced by the movement of one or more pendulums from vertical (zero weight) to horizontal (maximum weight).

PENDULUM SAW

A circular saw that swings in a vertical arc for crosscuts.

PANEL POINT

The point in a framed structure where a vertical or diagonal member and a chord intersect.

OMNIMETER

A theodolite with a microscope that can be used to observe vertical angular movement of the telescope.

NORMAL AXIS

The vertical axis of an aircraft or missile.

NONBEARING WALL

A wall that bears no vertical weight other than its own.

NIPHER SHIELD

A conically shaped, copper, rain-gage shield; used to prevent the formation of vertical wind eddies in the vicinity of the mouth of the gage, thereby making the rainfall catch a representative one.

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