Paper ruled with two sets of mutuallyperpendicular parallel lines, one set being spaced according to the logarithms of consecutive numbers, and the other set uniformly spaced.
Related Terms 
DIRECTIVITY FACTOR

POISSON RATIO
The ratio of the transverse contracting strain to the elongation strain when a rod is stretched by forces which are applied at its ends and which are parallel to the rod's axis.

PLANE STRESS
A state of stress in which two of the principal stresses are always parallel to a given plane and are constant in the normal direction.

PI FILTER
A filter that has a series element and two parallel elements connected in the shape of the Greek letter pi ().

PIGTAIL SPLICE
A splice made by twisting together the bared ends of parallel conductors.

PARALLEL CUT
A group of parallel holes, not all charged with explosive, to create the initial cavity to which the loaded holes break in blasting a development round. Also known as burn cut.

PARALLEL AXIS THEOREM
A theorem which states that the moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia that the body would have about the given axis if all the mass of the body were located at the center of mass.

PARALLEL SERIES
Circuit in which two or more parts are connected together in parallel to form parallel circuits, and in which these circuits are then connected together in series so that both methods of connection appear.

PARALLEL RELIABILITY
[SYS ENG] Property of a system composed of functionally parallel elements in such a way that if one of the elements fails, the parallel units will continue to carry out the system function.

PARALLEL LINKAGE
An automotive steering system that has a short idler arm mounted parallel to the pitman arm.
