This instrument is used for measuring the resistance against tearing of
paper, board, pl astic lms and other similar materials. An initial cut is
made in a set of test piece, which are then torn through a given distance.
The work done in the test piece is measured as the loss in potential
energy of a pendulum which is free to swing on it horizontal axis
provided with single pendulum. A calibrated scale indicates the mean
tearing force.

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