qunneeeeeeee ae 0018933 from Shot Yellowwood did not develop to the extent predicted, and launching signals were sent only to the launchers on Mary and Sally at H 4 13-1/2 minutes, All rockets launched successfully, The rockets on Wilma were intentionally not launched, because it was apparent that their trajectories would not intersect the cloud, seen to have missed the cloud. Even of those fired, four were Three nose cones were recovered, The cap on the first nose cone was still intact, probably due to a short in the circuit that fired the nose cap removal squib; therefore, no sample was collected. The second nose cone was froma rocket programmed to opep at 30,000 feet. of water. When recovered, the nose cone contained about 60 ml, At H / 9 hours the filter of this nose cone read about 1 mr, /hro at the surface, The third nose cone was from a rocket programmed to open at 55,000 feet. About 100 ml. of water had leaked into it, and the surface reading of its filter was 25 mr./hr at H 4 9-1/2 hours, After this shot, an intensive effort was made to determine the cause of leakage of water into the nose cones, It was found that the ball joint sealing the forward end of the nose cone after sampling could bounce back a small amount after closure, thereby permitting water to enter. <A latching mechanism was designed to lock the ball joint in its totally closed position. This modification was then applied to all nose cones, SAN BRUNE ruG 96 a