div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Dr L R Farnell src=https:reader036vdocumentsinreader036viewer2022082617575067d01a28ab0f07ad4631html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1934 Nature Publishing Grouppdiv