extended period of the operation required the equipment to function under conditions considerably different than anticipated. Destruction of supnlies and spare parts ty the fire after Shot 1 severely hampered re-conditioning damaged apparatus and correcting anomalies as they developed. Chances in shot scheduling particuiarly curtailed the usefulness of the free-floeting bioys. 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 exvosed to the atmosvhere,. A brief evaluation of the stations and apparatus used at CASTLE is given here as an sid for planning future field programs. 3.261 Islend Stations Coliecting 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 2 tat ee fe ae The raft stations were well designed except for a few details. Greater care shoul¢e be taken to insure that the battery is protected from sea water. The moorings were not installed as specified originslly Al “a ote. hs args. Free-floating Sea Station Being Launched