Trevor is a collector and researcher of Woodburytype slides. Walter Bentley Woodbury invented the highest-quality, most permanent photographic process ever developed, as well as one of the most important redesigns of the magic lantern.

 

The genius of the Woodburytype process that he patented at the end of 1864 and first demonstrated in 1865 is that, instead of representing variations of tone across the surface of the plate or slide, as in a traditional photograph, it produces a three-dimensional model of the image, using the depth of the ink to represent changes of tone without grain. It is also highly stable and capable of mass production on a factory scale.​