Moving-film photographs

Galvonogroph. The photographic record of a sensitive galvanometer arranged so that the mirror deflects a beam of light onto a moving film or paper... 

Develop only one sheet of film at a time or use a sheet film developing tray (see Resources Photographers Formulary). Use the intermittent agitation method I describe in Chapter 4 Agitation and do not lift the negative from the developer until it is time to move it to a water... 

Development continues as an example—there is a move away from organic solvents to aqueous developers. The use of silver halide photographic film for imaging has been replaced by computer-controlled laser scanning. 

Consider Wiener s interference experiment shown in Fig. 11 on the particle theory. On this theory we have photons moving towards the mirror, which bounce off from it and come back. These photons pass through the photographic film as they move towards the mirror, and as they come back. If a photon hits a grain of silver bromide in the film, it is absorbed by the grain and so disappears. It is clear that the plate should be uniformly affected all over and not show the bands which are actually observed. In the bands, however, only some of the grains are affected, which cannot be explained on the wave theory. It is clear that what is required is some sort of combination of the two theories. This will be considered in the next chapter. 

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