本机是以垂直自由落锤方式来测试橡胶材料之弹性。先调整仪器水平，再提升落锤至一定高度，放置试片时，应注意使落点距离试片边缘14mm以上。前三次之试验不采用，记录第四次、第五次及第六次之反弹高度并取平均值。 This machine is to test the resilience of rubber by vertical. Level the machine and raise the plunger at given heightabove the specimen. Release the plunger to have it slidefreely on it`s guide rod and then record the average resiience hight for the 4th,5th,and 6th impacts.