page 127 



AIRMAN'S VIEW, TEST ABLE. This picture taken 

 at high altitude, gives the impression that the Test 

 Able bomb was detonated in darkness. Actually 

 the bomb was exploded at nine o'clock in the 

 morning in bright sunshine; the darkness of the 

 photograph is due to the density of filter used. 



The flash itself was sufficiently intense to appear 

 brilliant through even the darkest filters commer- 

 cially available. Typical statistics recorded were: 

 type of film, exposure time, filter values, lens aper- 

 ture, starting time, means of starting, interval be- 

 tween pictures, and aiming point. 



