Gabriel Lippmann
Lippmann projected an image onto a special photographic plate. The plate was able to record details smaller than the wavelengths of visible light. The light passed through a glass sheet into a very thin and almost transparent photographic emulsion. The emulsion containing extremely small silver halide grains. A temporary mirror of liquid mercury reflected the light back through the emulsion/ This created standing waves. The nodes almost no effect but their antinodes created an  image. After development, the result was distinct parallel layers made up of submicroscopic metallic silver grains. These layers were a permanent record of the standing waves. In each part of the image, the spacing of the layers corresponded to the half-wavelengths of the light photographed.