Looking through an issue of Occult Digest, I saw a listing for a book by local spirit photographer W.K. Dunmore, "Photographing the Unseen." After a variety of fruitless searches I worried that this book was lost to history.
At some point I realized that this book was taken from a collection of essays in Occult Digest's predecessor, Psychic Power magazine. So I tracked down the appropriate issues in archives and took the time to scan each article, collecting them into a single PDF.
So if you are interested in the methods of a Chicago-based spirit photographer from the earlier part of the 20th Century, visit this link:
The file looks much better when downloaded than when viewed in a web browser.
For more information about W.K. Dunmore, see this earlier post regarding Psychic Power magazine.