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CREW LINEUP ON SAIDOR, TEST ABLE. Officers 

 and men of fhe carrier "Saidor," assembled on the 

 flight deck, rehearse the safety procedure followed 

 on Able Day to protect their eyes from the blind- 

 ing light emitted by the explosion. The most in- 

 tense portion of the flash, many times the brilliance 

 of. the sun, lasts for but a few millionths of a sec- 

 ond. As a cause of injury to human sight the 

 flash makes up in intensity what it lacks in dura- 

 tion. Even after the fading of the flash to a state 

 of lesser brilliancy it is still a hazard to the eye. 

 To guard their eyesight persons without goggles 

 were ordered to stand as shown above with their 

 backs toward the blast and to remain in this posi- 

 tion until the all-clear signal was given several 

 seconds after the instant of explosion. The Task 

 Force also used a total of 6000 pairs of dark gog- 

 gles, developed primarily for use by scientists and 

 members of the technical and observer groups 

 during the moment of greatest brilliance. 



