Abstract: The measuring equipment is used for the optical monitoring of cracks in mrial test pieces, which are loaded by a loading device. A television camera trained on the test piece is connected to a discriminator which converts the image points of the television image into binary pulses. The binary pulses of the television image are stored from time to time in a store. A comparator compares the contents of the store with the binary pulses of a consecutive television image and ascertains deviations between two consecutively-taken television images. The number of the non-coincident binary pulses of the compared television images is counted and indicated.

Abstract: A strain gauge pick-up for the measurement of a test piece. This pick-up ludes two tapping points mounted on a pair of rigid elbow members. The elbow members are spaced a predetermined distance apart, and their spacing varies as the tapping points are applied to the test piece. The elbow members are attached to the deflection plate which flexes as the spacing between the elbow members changes. A wire strain gauge is positioned on the deflection plate and senses the flexing motion. Several pick-ups can be integrated so that their tapping points are substantially colinear.