 | Benjamin Joy Jeffries - 1879 - 336 lehte
...color-blindness with the signal-colors, and especially to convince, if necessary, the railway employ^s and others who are not specialists, the examination...color, like the red flag used as signals on railways. The color should be that of II. b of the plate, rather towards yellowish red. " Rule. — This test,... | |
 | Benjamin Joy Jeffries - 1879 - 354 lehte
...But to be more entirely convinced of the relation of complete color-blindness with the signal-colors, and especially to convince, if necessary, the railway...only serves to corroborate the investigation. " TEST IH. — The red skein is presented to the subject. It is necessary to have a vivid red color, like... | |
 | Benjamin Joy Jeffries - 1880 - 344 lehte
...green-bliud, and vice versa. places a violet or blue skein side of ITS DANGERS AND ITS DETECTION. 215 ploye's and others who are not specialists, the examination...color, like the red flag used as signals on railways. The color should be that of II. 6 of the plate, rather towards yellowish red. " Rule. — This test,... | |
 | Kansas Academy of Science - 1881 - 146 lehte
...test selects with purple only green and gray, or one of them, is completely greenblind. Test third : The red skein is presented to the subject. It is necessary...color, like the red flag used as signals on railways. This test, which is applied only to those completely color-blind, should be continued until the person... | |
 | Benjamin Joy Jeffries - 1885 - 364 lehte
...color-blindness with the signal-colors, and especially to convince, if necessary, the railway employe"s and others who are not specialists, the examination...only serves to corroborate the investigation. " TEST HI. — The red skein is presented to the subject. It is necessary to have a vivid red color, like... | |
 | William Fisher Norris - 1897 - 608 lehte
...and serves only as a confirmation of it. " Test III. — The red skein is presented to the examinee. It is necessary to have a vivid red color, like the red flag used as signals on railways. The color should be that of lib of the plate, rather towards yellowish red. " Rule. — This test,... | |
 | Sir Henry Rosborough Swanzy - 1897 - 642 lehte
...trial may be made. It only serves to corroborate the diagnosis. Test lib. The red skein is presented. It is necessary to have a vivid red color, like the red flag used as signals on railways. This test, which is applied only to those either " completely red-blind," or " completely green-blind,"... | |
 | Kansas Academy of Science - 1906 - 424 lehte
...test selects with purple only green and gray, or one of them, is completely greenblind. Test third : The red skein is presented to the subject. It is necessary...color, like the red flag used as signals on railways. This test, which is applied only to those completely color-blind, should be continued until the person... | |
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II. b of the plate, rather towards yellowish red. " Rule. — This test, which is applied only to those completely color-blind, should be continued until the person examined has placed beside the specimen all the skeins belonging to this shade or the... 