div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader030vdocumentsnetreader030viewer2022020119575067c11a28ab0f07acfd06html5page1jpg target=_blank img data-url=relative-intensities-of-the-d1-d2-lines-of-sodium-in-comets-and-in-low-pressurehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Relative Intensities of the D1 D2 Lines of Sodium in Comets and in Low Pressure Laboratory Sources loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentsnetreader030viewer2022020119575067c11a28ab0f07acfd06html5thumbnails1jpg width=140 height=200 adivp©1926 Nature Publishing Grouppdiv