extended period of the operation required the equipment to function under conditions considerably different than anticipated. Destruction of supnlies and spare parts by the fire after Shot 1 severely hampered re-conditioning damaged avparatus and correcting anomalies as they develored. Chanres in shot scheduling particularly curtailed the usefulness of the free-floet ing buoys. Many of the devices which had performed satisfactorily at IVY and at the HEM tests were badly corroded during the long period of CASTLE. In general, experience at CASTLE emphasized the advantages of simple equipment that could be modified readily to meet a variety of conditions. Likewise, it stressed the need for using non-corrosive materials in the construction of all apparatus exnosed to the atmosohere, A brief evaluation of the stations and apparatus used at CASTLE is given here as an sid for planning future field programs. 3.2.1 Islend Stations Collecting devices were located in conergte~lined dugouts. The IVY stations//had been constructed on the ground level. In both cases sand tended to drift into collecting devices indicating a larger quantity of solids than actually fell after a shot. It would be preferable for future operations if the collecting equipment could be located above the ground level and still be protected egainst blast damage. 3.2.2 Legoon Stations The raft stations were well designed except for a few details. Greater cere shoule be taken to insure that the battery is protected from sea water, The moorings were not installed as specified originelly Al Fie. 3.4 Free-flosting Sea Station Beince Launched