div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Volume Flow of Plastic Materials src=https:reader038vdocumentsusreader038viewer2022100502575067ee1a28ab0f07adcef2html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1946 Nature Publishing Grouppdiv