The Ophthalmoscope Volume 2
The Ophthalmoscope Volume 2
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Author: Books Group
Number of Pages: 242 pages
Published Date: 20 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: PDF
ISBN: 9781236268969
File size: 18 Mb
Download Link: The Ophthalmoscope Volume 2
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...PA., C.S.A. The conditions under which signal-colours for railway and marine service and for use in the army and navy are employed are so varied, and the choice of exact tinting of the colours themselves are so arbitrary, that no absolute dependence can be placed upon the results that are practically obtained during their every-day use in such work. For example, individual experience in different parts of the world has time and again convinced me that the coarse empiricial selections of gross pigment hues used for railway signalling have evidently too often been selected by ignorant mechanics or employed by reason of the mere accident of ready possession." An appeal similar to this was made by the writer at the last annual meeting of the Mexican Ophthalmological Society. t England has some of its most important railways protected toy' the Abney system of carefully selected red and green colour, values that have been made to conform with the character and the nature of the artificial illumination used. This is only too apparent to any chance observer who may be placed in such a situation as to have many of the usually employed signal lights simultaneously exposed to his view. Under such circumstances he cannot fail to notice the variability of tint and hue, in, for example, the numerous. supposedly identical signal lights used in any of the large railway yards, or not see the inconstancy of colouration in the colour signals that are employed on the many boats that are almost constantly plying in busy harbours; each combination of colour, and of colour alone ofttimes representing the entire question whether a definite action must or must not be taken--and this action the ofttimes only possible answer that is decisive for safety or for dangerous accidents...
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The Ophthalmoscope Volume 2 by Books Group
Author: Books Group
Number of Pages: 242 pages
Published Date: 20 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: PDF
ISBN: 9781236268969
File size: 18 Mb
Download Link: The Ophthalmoscope Volume 2
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...PA., C.S.A. The conditions under which signal-colours for railway and marine service and for use in the army and navy are employed are so varied, and the choice of exact tinting of the colours themselves are so arbitrary, that no absolute dependence can be placed upon the results that are practically obtained during their every-day use in such work. For example, individual experience in different parts of the world has time and again convinced me that the coarse empiricial selections of gross pigment hues used for railway signalling have evidently too often been selected by ignorant mechanics or employed by reason of the mere accident of ready possession." An appeal similar to this was made by the writer at the last annual meeting of the Mexican Ophthalmological Society. t England has some of its most important railways protected toy' the Abney system of carefully selected red and green colour, values that have been made to conform with the character and the nature of the artificial illumination used. This is only too apparent to any chance observer who may be placed in such a situation as to have many of the usually employed signal lights simultaneously exposed to his view. Under such circumstances he cannot fail to notice the variability of tint and hue, in, for example, the numerous. supposedly identical signal lights used in any of the large railway yards, or not see the inconstancy of colouration in the colour signals that are employed on the many boats that are almost constantly plying in busy harbours; each combination of colour, and of colour alone ofttimes representing the entire question whether a definite action must or must not be taken--and this action the ofttimes only possible answer that is decisive for safety or for dangerous accidents...
Read online The Ophthalmoscope Volume 2 Buy The Ophthalmoscope Volume 2 Download The Ophthalmoscope Volume 2 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook The Ophthalmoscope Volume 2
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Download ebook Schach von A-Z : Alles über Eröffnungen, Taktik, Strategie und Endspiele
Three Mystical Tables of Dionysius Andreas Freher pdf
Download Treatment of Eating Disorders : Bridging the Research-practice Gap