伯格在他的工程事业中,曾在海角城做过大量应变的测量工作,但从未在活体上做过试验。他的植物学家朋友卡尔·舒特希望有一种好办法采取代用钢尺测量树干的变化。因此现任衣阿华州立科技大学工程科学和力学教授的伯格开始将应变计捆在一棵原产于南非的八英尺高的硬木树上进行试验。出乎他的预料,这种将试验力学的原理应用于 In his engineering career, Berg had done a great deal of strain measurement in Cape Town but never tested on the living. His botanist friend Karl Schutter hopes there is a good way to take the alternative steel ruler to measure changes in the trunk. So Borg, a professor of engineering science and mechanics at Iowa State University of Technology, began experimenting with a strain gauge in a hardwood tree eight feet tall that originated in South Africa. Contrary to his expectation, this applies the principle of experimental mechanics to it