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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

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