div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: masspecscrippseduphotographed with a Graflex camera with f :45 lens using either orthochromatic or panchromatic film The sweep calibrator trlpped the pulse generator and also src=https:reader033fdocumentsusreader033viewer20220419165e69bd5d058f4108136fde1ahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: masspecscrippseduphotographed with a Graflex camera with f :45 lens using either orthochromatic or panchromatic film The sweep calibrator trlpped the pulse generator and also src=https:reader033fdocumentsusreader033viewer20220419165e69bd5d058f4108136fde1ahtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: masspecscrippseduphotographed with a Graflex camera with f :45 lens using either orthochromatic or panchromatic film The sweep calibrator trlpped the pulse generator and also src=https:reader033fdocumentsusreader033viewer20220419165e69bd5d058f4108136fde1ahtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdiv