Author : United States Army
Publisher : Forgotten Books
ISBN 13 : 9781391760766
Total Pages : 242 pages
Book Rating : 4.7/5 (67 download)
Book Synopsis U. S. Army Medical Supply Services School Text Book, Vol. 4 by : United States Army
Download or read book U. S. Army Medical Supply Services School Text Book, Vol. 4 written by United States Army and published by Forgotten Books. This book was released on 2018-10-11 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from U. S. Army Medical Supply Services School Text Book, Vol. 4: Optical, Sections I to XVII If the reverse side of the lens is to be curved. The pieces of glass are te mounted with the other side up and this is ground in the same way, using whatever curvature is called for, which may or may not be the same as that of the first side. Washing and rigid inspection follow. The lenses are lacquered to protect their surfaces until completed. They have still to be cut and edged to the desired size and shwe. All told there are some forty-five inspections before good eyeglasses lenses are finally approved; the final inspection is made by means of an instrument which checks up on that vital question of whether they actually bend the rays of light exactly as desired. This instrument is called a lensometer, vertometer, or other name as the different manufacturers may designate. 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.
