div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=the-mass-of-the-particlehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: The Mass of the α Particle loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentsmxreader030viewer2022020522575067a71a28ab0f07ac89cchtml5thumbnails1jpg width=140 height=200 divp© 1907 Nature Publishing Grouppdiv