Excerpt from The Grand Canon of Arizona Through the Stereoscope: The Underwood Patent Map System Combined With Eighteen Original Stereoscopic Photographs Stereoscopic photographs or stereo graphs are not just little pictures. When a stereograph is held in the hand and looked at with the unaided eye it seems to the inexperienced observer like a pair of photographs j ust alike, mounted side by side on one card. The fact is that the two parts are not alike - the negatives were taken at the same instant, but with two different lenses, set side by side in the camera about as far apart as a man's two eyes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at forgottenbooks 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.