This is Edinburgh, 1961 by Miroslav Sasek is a guidebook about Edinburgh, in which he talks about the Camera Obscura. Here is an excerpt:

As we start down the Royal Mile, which runs though the Old Town from the Castle to Holyrood Palace, we stop for a look at Edinburgh in the Camera Obscura.

It’s no Magic, it’s “nature’s TV”, a kind of periscope.

The wonderful 1946 British movie ‘A Matter of Life and Death’ (British title) or ‘Stairway to Heaven’ (US title) features a scene inside a camera obscura. It is a fantasy story of a British flyer, played by David Niven, who refuses to die after falling in love with an American WAC (Women’s Auxiliary Corps) during his last moments of life. A beautifully conceived scene in a camera obscura between the WAC and an English doctor is short but effective. You can find it on DVD or in a revival of old movies and it is a delight on many levels.

The Underground Man by Mick Jackson, Penguin, 1998, is a novel about a real 19th century eccentric, the Duke of Portland. In one of the later chapters of the book he visits the Camera Obscura in Edinburgh.
Here is a passage from the book:
Like my co-spectators I rested my hands on a circular railing and looked down on a broad concave table-perfectly smooth and white – whilst the woman in tweed pressed on with her practiced intonation about the room in which we stood. With one hand she had told of a long wooden rod which hung down from the high ceiling and as our eyes accustomed themselves to the dark she gradually became more visible. Her hands and face had about them a ghostly luminosity. She twisted the rod, saying, ‘… the same principle as the camera. A tiny aperture in the roof allows an image to be cast on the dish below…’

Girl with a Pearl Earring by Tracy Chevalier, Dutton, 1999

This is a novel about a young girl who works as a maid in the household of the painter Vermeer. The novel includes a scene with a camera obscura. This is a delightful book and well worth reading.

The Secrets of the Camera Obscura, a Novella by David Knowles. Chronicle Books, San Francisco, California, 1994

A strange mystery set in a camera obscura. Here is an extract from the book:

…in the centre of the room rests a circular screen, three and half feet in diameter, which acts as the focal point for light that enters the chamber from a kind of periscope in the ceiling. The whole thing is done with mirrors. What you get is the live image of the outside world, the cliffs to the north, the ocean, and the windmills in the park…

This article is adapted from one on Jack & Beverly Wilgus’s website: http://brightbytes.com.  Theirs is the best website on camera obscuras that we know of.