Color-names, Color-blindness, and the Education of the Color-sense in Our Schools PDF Download
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Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Color blindness
Languages : en
Pages : 20
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Book Description
Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Color blindness
Languages : en
Pages : 20
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Book Description
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 :
Languages : en
Pages : 11
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Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Children
Languages : en
Pages : 18
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Book Description
Author: R. Brudenell Carter
Publisher:
ISBN:
Category : Color blindness
Languages : en
Pages : 28
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Author: Arlene Evans
Publisher:
ISBN: 9780974352008
Category : Juvenile Nonfiction
Languages : en
Pages : 78
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Book Description
Colorblindness explained for kids.
Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
Author:
Publisher:
ISBN:
Category : Education
Languages : en
Pages : 412
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Book Description
Author: P. Lanthony
Publisher: Wayenborgh Publishing
ISBN: 9062999034
Category : Medical
Languages : en
Pages : 227
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Author: Benjamin Joy Jeffries
Publisher:
ISBN:
Category : Accidents
Languages : en
Pages : 354
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Book Description
