div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=progress-medal-of-the-photographic-society-of-america-dr-c-e-k-mees-frshtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Progress Medal of the Photographic Society of America: Dr C E K Mees FRS loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer2022020522575067f31a28ab0f07ade685html5thumbnails1jpg width=140 height=200 divp© 1949 Nature Publishing Grouppdiv