Color-blindness : its dangers and its detection / by B. Joy Jeffries.

  • Benjamin Joy Jeffries
Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: Color-blindness : its dangers and its detection / by B. Joy Jeffries. Source: Wellcome Collection.

    285/346 (page 257)
    tinuance, for both the army and navy, formulated the rules to be followed under No. 3. This has been since published, and is now only awaiting royal sanction. It is as follows. — F. Holmgren, January, 1879.] 5th.—1st Part, Sect. 7. The naval service calls for no especial bodily condition other than the physical condition required in the line, ex- cept the addition of assured normal color-perception, (Vide the Addendum.) Addendum. — Special Examination, Sect. 19. In reference to normal color-sense, care is to be taken that no one is admitted into the naval service whom the examination proves to be in any degree red-blind, green- blind, or pai-tially color-blind. The test for color-perception is to be can'ied out by Pro- fessor Holmgren's method, by which partial color-blindness is determined from the confusion of the light green, or first samj)le, with gray, brownish gray, yellowish green, pale red, or pale grayish pui-ple (1, 2, 3, 4, or 5). Red-blindness is determined by confusing, with the pur- ple (II.), blue and violet (6 and 7) ; green-blindness, by confusing, with the purple, green and gray (8 and 9). Com- pare Color-Blindness in its Relations to Railroads and the Marine, by Frithiof Holmgren. Sect. 21. For these examinations, the following appa- ratus, &c., is necessary, enclosed in a box; viz., a copy of the above-mentioned book, and a collection of the worsteds. The following are in general the regulations of the Norwegian Government of date May 7,1877: — 1st, By order of the civil department, all rail- road employes are examined by Professor Holm- gren's method. 2d, By order of the navy department, the pnpils in the navy-of&cers' school are to be tested for color- blindness, as also all enrolled in permanent service. 8d, It is now under advisement to require pilots to be tested for color-blindness; but regulations are not yet arranged and carried out.