Featured on PDR in the collection Spectropia; or, Surprising Spectral Illusions (1865)
A book of Victorian hi-tech ghost conjuring which allows the reader to summon, as the sub-title proclaims, "ghosts everywhere and of any colour". Accompanying the set of wonderfully gaudy images, are directions on how to use them, and a more detailed scientific description about how the illusion works. Also included in the latter is a declaration of at least one motive behind the book: