How Does Hope's Face Resemble His Deceased Father?

Hope also took a photograph of the members of the society for the study of supernormal pictures, which is what we were going to call the alchemical actors originally. Hope took the plate from his own secretary, and a face surfaced, again, much larger and superimposed over the whole assembly. One of the members actually recognized the face as resembling his deceased father. William crooks also experimented with hope in his own lab, and a white circle appeared, hovering over him like a moon, with a face inside the circle. Major r e e spencer experimented with his own camera plates and dark room. And in spene spencer's investigation, hope's only contact was with the camera