Photographing the invisible : practical studies in spirit photography, spirit portraiture, and other rare but allied phenomena (1911)
Coates, James · London : L.N. Fowler & Co. ; Chicago : Advanced Thought Publishing Co. · leaf 368
346 PHOTOGRAPHING THE INVISIBLE better qualitied.” It soon became clear that the light by which the plates were affected is other than sun- light, flashlight, electricity, incandescent gaslight. What this light is, is not as yet fully known. It … appears allied to the violet rays of the spectrum. Whether so or not, the light is invisible which affects the plates. The author of The Veil Lifted, in his lifetime, having given me permission to make certain extracts from that work, I take the above illustration from
Photography of the invisible · Spiritualism · Spirit photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Illustrated catalogue of the eigth [sic] series of 100 paintings by old masters of the Dutch, Flemish, Italian, French, and English schools : being a portion of the Sedelmeyer Gallery which contains about 1500 original pictures by ancient and modern artists (1902)](https://img.insideoutlibrary.com/img/200/ia-illeigt00gale-142-94.webp)
