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Author: Sidney Lerman
Publisher: MacMillan
ISBN:
Category : Medical
Languages : en
Pages : 350
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Book Description
Author: Sidney Lerman
Publisher: MacMillan
ISBN:
Category : Medical
Languages : en
Pages : 350
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Book Description
Author: Frederick Herman Verhoeff
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 196
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Book Description
Author: F. H. Verhoeff
Publisher: Forgotten Books
ISBN: 9780332003238
Category : Science
Languages : en
Pages : 200
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Book Description
Excerpt from The Pathological Effects of Radiant Energy on the Eye: An Experimental Investigation All radiant energy is at present believed to consist of transverse vibrations in the hypothetical ether, all propagated at the same rate and differing only in amplitude and wave length, hence in frequency, which is the reciprocal of wave length. The uniform propagation rate in vacuo is very nearly km. Per second and the wave lengths so far as ordinarily dealt with range from about 01 to about 0002 mm. For ordinary purposes no attention need be paid to the extremely long wave lengths ranging to 1 mm., to the extremely short ones between 0001 and 0002 mm., or to the enormously shorter one still of the order of magnitude of 0000001 111m. Such as the X-rays are believed to be. For the very long waves are not present in material amount in the radiation from ordinary sources. The very short ones are absorbed by a few cm. Or dm. Of air, and the X-rays are practically only produced in apparatus intended for that purpose. The spectra given by all ordinary sources range between the more modest limits just given. In the earlier literature this spectral range used to be divided into heat rays, light rays, and actinic rays, a distinction wholly artificial since the three effects implied are far from being sharply defined. More generally the whole range is divided into the infra red portion, not ordinarily visible and extending from the longest waves to those of about 760 1111, the visible spectrum, extending from about 7601111 to about 395 and the ultra violet portion reaching from 395 up to' the neighborhood of 200 ma. This distinction is not rigorous or with sharp limits. While artificial distinctions have led to many misunderstandings,1_ all radiation of Whatever wave length is convertible into heat wheri absorbed by material bodies and may produce chemical changes as well. As a matter of fact these latter show a general tendency to increase with the frequency of the oscilla tions, so that chemical changes are rare in the infra red and increasingly frequent as one approaches the extreme ultra violet. It is this tend ency that is shown in the pathological changes which may be caused in living cells by the incidence of radiation. 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.
Author: Louis 1864-1923 Bell
Publisher: Wentworth Press
ISBN: 9781373789075
Category : History
Languages : en
Pages : 196
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: HardPress
Publisher: Hardpress Publishing
ISBN: 9781314242157
Category :
Languages : en
Pages : 202
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Book Description
Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
Author: Charles Sheard
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 21
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Book Description
Author: Frederick Herman Verhoeff
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 204
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Book Description
Author: Charles Sheard
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: Frederick Booth
Publisher: Legare Street Press
ISBN: 9781021643278
Category : History
Languages : en
Pages : 0
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Book Description
This pioneering work on the use of radiant energy in ophthalmology is a must-read for anyone interested in the history of medical science. The author, a noted ophthalmologist and scientist, provides a detailed account of his experiments and research on the effects of radiant energy on the human eye. He also explores the potential applications of this technology for the treatment of various eye disorders. With clear language and detailed illustrations, this book is an accessible introduction to an important area of medical research. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Harvey M. Schamp
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
