The Keepers of the Light

Reading an interesting book at the moment. I heard about this book some time ago (while listening to the excellent History of Photography podcast by Jeff Curto. It's not your usual podcast, its actually a recording of his university lecturers). Astute readers of my blog may notice the slight resemblance to the title of this blog!!  Anyway, it's called The Keepers of Light: A History and Working Guide to Early Photographic Processes. It's no longer in print, but used copies are readily available. I got mine from Amazon