The determination of distension and strength of grains of any leather sample may conveniently be carried out with the help of the ball burst test. In this test, a hemispherical hardened metallic tip is pressed against one face of the leather disc held in a suitable non-slipping grip and the force needed to make the tip pierce through the test specimen determined to evaluate the grain strength. The distention of leather at which the tip through is also determined. The apparatus used for this evaluation is called Lastometer
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