In 1853, Charles Grafton Page of Washington, D.C., investigated the Fox sisters. As a patent examiner and patent advocate, Page had developed a keen eye for detecting fraudulent claims about science. He applied these skills in exposing some of the deceptions employed by the Fox sisters during two sessions which he attended. In his book "Psychomancy" (1853), Page observed that the rapping sounds came from underneath the girls' long dresses. When he asked if the spirits could produce a sound at a distance from their own bodies, one girl climbed into a wardrobe closet where her dress touched the wood, whence the sound transmitted into the wood plank — however, she was unable to control this sound sufficiently to produce spirit communications. Page devised contraptions that emulated the rapping sounds produced by the girls, which could be concealed under long clothing. He declaimed the girls' means of hiding from the bodily examination that would expose their fraud: