These images are from Nandor Fodor’s personal scrapbook. They show Margery Crandon conducting an experiment involving a scale. The attached caption reads, “A cylinder which was invisible to normal eyesight photographed by quartz lens (which is sensitive to ultra-violet rays) in the Margery scale experiments. It was said to be a spirit instrument, having a suctional effect on the pan of the scale which should have been in total balance.”
Super-physical suction cylinder, Folder “Margery”, Box D, Eileen J. Garrett Parapsychology Foundation Collection, Collection 331, Special Collections, University of Maryland, Baltimore County (Baltimore, MD).