Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Color blindness
Languages : en
Pages : 20

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Author: Benjamin Joy Jeffries
Publisher: Forgotten Books
ISBN: 9780259519515
Category : Psychology
Languages : en
Pages : 20

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Book Description
Excerpt from Color-Names, Color-Blindness, and the Education of the Color-Sense in Our Schools Investigation of a railroad accident in Sweden, supposed to be due to color-blindness, led Dr. F. Holmgren, professor of physiology in the University of Upsala, to the belief that the defect must be ftc quent, and hence dangerous on both land and sea. Difficulty arose as to any certain method of detecting it quickly. The absence of any such method has been the especial reason why the defect has hitherto escaped observation. Using the theory of young-helmholtz, and applying a test suggested by Seebeck, he finally brought out his now well-known method with the colored worsteds. By this, and the imitations of it devised here and there, large numbers of persons have been examined all over the world, including both sexes, all colors, ages, and degrees of civilizations, etc. It is a curious fact, that till the expert could test quickly and accurately, the existence of color blindness to the extent now proved remained unknown. It is now admitted that four per cent. Of males are more or less color-blind, and in females not over one-fourth of one per cent. Are thus affected. My own tests, up to the time of writing this, are of males 801 were color-blind, whilst I found but 1 1 females among defect ive in their chromatic sense. 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: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Color blindness
Languages : en
Pages : 20

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Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Children
Languages : en
Pages : 18

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Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category :
Languages : en
Pages : 11

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 144

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Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.

Author: Anonymous
Publisher: BoD – Books on Demand
ISBN: 3385360099
Category : Fiction
Languages : en
Pages : 42

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Book Description
Reprint of the original, first published in 1883.

Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Color vision
Languages : en
Pages : 40

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Author: P. Lanthony
Publisher: Wayenborgh Publishing
ISBN: 9062999034
Category : Medical
Languages : en
Pages : 227

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Author: Anonymous
Publisher: Palala Press
ISBN:
Category : History
Languages : en
Pages : 318

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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.