Technograph volume 38 1925 1926

Cover Technograph volume 38 1925 1926
Technograph volume 38 1925 1926
Edward Stanwood
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0 4. (1 5. 5 78. 2 KWKMAO Oranse Black S 0. 0 41. 4 3. 6 5. 9 67. 8 DKMKRA Black Red 9 5. 9 41. 0 3. 7 5. 7 62. 1 WUKMKRA White Red in 0. 0 59. 0 3. S 6. 4 93. 0 . MWKAKDR Black Yel-w 11 1. 0 65. 0 3, 9 6. 4 72. 4 KMRWDAK L'v'dr 12 5. 9 41. 0 3. 9 5. 4 50. 6 WKDAMRK Yellow Blue NOTE: All obse rvers read all letters in five second j^ Observers : . Lunio Civ I F. NBin eering Students C. E 54 ria The first groitii of tests were conducted under artificial conditions similar to those encountered in ...night driving. The a])i)ai'atus for these tests con sisted of a rectangular box four by six feet in size mounted on a pedestal so that the box could be swung in a complete horizontal circle. The interior of the box was painted a dead black so that the reflection of light would be the least possible, which is about the condition of the actual background of highway signs. A spotlight was ari;inged to throw a direct ray into the [tt)X and thus illuminate the signs placed therein. These artificial tests were con- ducted ii]>on three sets of signs, and were twelve, twenty-five and ten in number.

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