Author :
Publisher : Forgotten Books
ISBN 13 : 9780266145509
Total Pages : 390 pages
Book Rating : 4.1/5 (455 download)
Book Synopsis Photo-Era Magazine, Vol. 50 by :
Download or read book Photo-Era Magazine, Vol. 50 written by and published by Forgotten Books. This book was released on 2017-11-17 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Photo-Era Magazine, Vol. 50: The American Journal of Photography; An Illustrated Monthly of Photography and Allied Arts; January 1923, to June 1923, Inclusive AS an example of what photography may mean to the structural engineer, we may cite the case of the Quebec bridge collapse. The first collapse occured when the cantilever on the approach piers gave way in a wind-storm, killing nearly a hundred men, and entailing a loss of half a million dollars. The engineer in charge of the erection designs was held criminally liable. He was positive that his design was safe, and asserted his belief that not all of the steel-stays were anchored. He even marked on the plans the ones he believed were loose. The daily record photographs were produced, and his contention was upheld, even to the correct designation of the stays left slack. These had allowed the span to sway, and eventually collapse. By means of these records, the engineer was saved from a very unpleasant situation. A similar case oc curred when the center-span, a chrome-steel double-truss of one thousand feet in length, cost ing a million dollars, slipped as it was being hoisted and fell into the channel, a total loss. The experts figured, and the superintendents consulted, but no reason could be assigned for the fall thereof, until some one remembered the motion-picture man - and then the cause stood clearly revealed. A cast roller-bearing at one corner had fractured, and the heel of the truss, striking the slanting surface of the shoe beneath, had swung clear of the hoisting-links, allowing all of the weight to come on the other three corners of the structure, which slowly folded up and collapsed. The fault was remedied in the next attempt, and the new span was hoisted successfully. Regarding photographic apparatus, the best is none too good. The exacting nature of the work tests even the best of modern lenses, and the number of trying situations that the building trades offer is a source of marvel and perplexity to the beginner, at least. Most prominent among specialties in this work is the use of the wide angle lens. There are cases where an angle of 90 degrees falls short of the requirements. The narrow street, with a tall building on the other side, is the source of much photographic difficulty. 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.
