div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: The 273 µ Absorption Band of Fused Silica src=https:reader036fdocumentsinreader036viewer2022080320575067d81a28ab0f07ad688chtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1937 Nature Publishing Grouppdiv