Lantern slides, how to make and color them (1897)

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This quality of negative has yielded slides which have been magnified up to 30 feet square, and still the lights and shades were beautiful. Lantern-slide plates in this country are 3^- inches wide and 4 inches long. Various manu- facturers make plates of these dimensions, packed one dozen in a box, the latter being carefully sealed in order to keep all light from the plates. The plates manufactured for lantern slides are generally quite thin, and the glass is supposed to be especially selected ; but, alas, there is plenty of room for improvement in this respect. The glass is coated with an emul- sion of silver which is sensitive to actinic light. By actinic light is meant any kind of light which causes a chemical change in the emulsion which can be detected or developed by using proper means. Throughout this work " actinic light" will mean the light used to photograph with, whether it is sunlight, gaslight, lamplight or candle-light. A rainbow is composed of seven so-called colors. One edge of it is red, the. other violet, with the five other colors lying between. By holding a common triangular glass prism in a sunbeam the same colors will be seen upon the ceiling or some part of the room. This beautiful band of seven visible colors is called the sun spectrum. Without entering into a physical discussion upon this subject, let it suffice to say that the glass prism decomposes the white (?) sunlight, or separates the various colors which together form white light, so that