Work beyond normal established working hours which usually requires a premium to be paid to the employees concerned.
Related Terms 
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.

OVERTONE
One of the normal modes of vibration of a vibrating system whose frequency is greater than that of the fundamental mode.

NORMAL TIME
1. The time required by a trained worker to perform a task at a normal pace. 2. The total of all the normal elemental times constituting a cycle or operation. Also known as base time; leveled time.

NORMAL PACE
The manual pace achieved by normal effort.

NORMAL MODE OF VIBRATION
Vibration of a coupled system in which the value of one of the normal coordinates oscillates and the values of all the other coordinates remain stationary.

NORMAL FREQUENCIES
The frequencies of the normal modes of vibration of a system.

MOLDING SHRINKAGE
Difference in dimensions between the molding and the mold cavity, measured at normal room temperature.

MEMOMOTION STUDY
A technique of work measurement and methods analysis using a motion picture camera operated at less than normal camera speed. Also known as camera study; micromotion study.

MEMBRANE STRESS
Stress which is equivalent to the average stress across the cross section involved and normal to the reference plane.

MEAN STRESS
1. The algebraic mean of mean stress mean temperature difference the maximum and minimum values of a periodically varying stress. 2. See octahedral normal stress.
