div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader042fdocumentsinreader042viewer2022020522575067fd1a28ab0f07ae141fhtml5page1jpg target=_blank img data-url=documentthe-north-of-england-institute-of-mining-and-mechanical-engineershtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: The North of England Institute of Mining and Mechanical Engineers loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsinreader042viewer2022020522575067fd1a28ab0f07ae141fhtml5thumbnails1jpg width=140 height=200 adivp© 1952 Nature Publishing Grouppdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imagea href=https:reader042fdocumentsinreader042viewer2022020522575067fd1a28ab0f07ae141fhtml5page2jpg target=_blank img data-url=documentthe-north-of-england-institute-of-mining-and-mechanical-engineershtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: The North of England Institute of Mining and Mechanical Engineers loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsinreader042viewer2022020522575067fd1a28ab0f07ae141fhtml5thumbnails2jpg width=140 height=200 adivp© 1952 Nature Publishing Grouppdiv