Book Description

Excerpt from Practical Photography: How to Make Lantern Slides What is a Lantern Slide? - In a negative we have the tones reversed, so that a white dress is black and a black object or a deep shadow is white. When we make our print from this, the tones are reversed again, this second reversal bringing them right. Such a print is a positive. We examine a print by reflected light, that is, the light falls on to the surface of the print and is thrown back or bent back. But if we make a print on glass, using for the purpose a dry plate, we still have a positive, but one which we must examine by looking through instead of at. Such a positive, because we can see through it, is often called a transparency. We examine it by transmitted light. Transparency, then, is a generic term for a positive picture on glass, or celluloid, or other transparent support. The support may even be of ground or opal glass, or the emulsion may have something added to it to give an opalescent or ground-glass effect, in which case it ceases to be transparent in the strict sense of the word, and is merely translucent, but it is still termed a transparency. Sometimes the expression "glass-positive" is used. Such transparencies have various uses. They may be employed for window decoration, for lamp shades, for advertising purposes, and so on. They may be used for reproducing the original negative the same size, or larger or smaller. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.