R. Austin Freeman, The Eye of Osiris — XVIII. John Bellingham (1911)
“ There is something singularly fascinating in the appearance of a developing photograph; in the gradual, mysterious emergence of the picture from the blank, white surface of plate or paper. But a skiagraph, or X-ray photograph, has a fascination all its own. Unlike the ordinary photograph, which yields a picture of things already seen, it gives a presentment of objects hitherto invisible; and hence, when Polton poured the developer on the already wet paper, we all craned over the tray with the keenest curiosity. ”
