div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=the-hardness-of-metals-and-its-measurementhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: The Hardness of Metals and its Measurement loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader036vdocumentsmxreader036viewer2022082617575067d41a28ab0f07ad579dhtml5thumbnails1jpg width=140 height=200 divp© 1935 Nature Publishing Grouppdiv