supply, fittings in flush tanks should all be rubber. Pipes, fittings and fix- tures utilizing either distilled water or salt water supply should be of special copper alloy, or other materials capable of resisting the corrosive effect of the spindrift which permeates the atmosphere. Detailed construction specifica- tions applicable to these materials will be the result of additional research and investigation. Since latrine facilities on the shot islands are to be expended by experiment operations, the use of vlumbing pipe ami fixtures ordinarily adapted to minimum cost installations is contemplated. The expected useful life of this type of construction under the corrosive conditions present would not greatly exceed that required by experiment operations and ultimate economy of expendable costs is thus accomplished. Electrical Materials, All lighting fixtures am wiring materials for use in buildings on Parry and Eniwetok and all lighting fixtures and wiring materials for those buildings which are intended for use in more than one operation should be of corrosion-resisting type. fixtures. It is contemplated to use vapor-proof lighting In general, exposed wiring using either exposed non-metallic sheathed cable or exposed corrosion-resisting conduit with moisture-resisting wire simi- lar to Type TW thermoplastic might be used. cellaneous fittings. might be aluminum alloy. of conventional construction. Conduit, boxes, plates, and misReceptacles and switches may be The heating element for dry closets may be either a special heating element available for this purpose or a standard lamp bulb en= closed with a wire screen. Construction specifications for these materials will be the result of additional research and investigation. For those buildings, tents, etc. on Experiment Islands which are considered expendable with each operation, it is believed that the use of weatherproof sockets, bare lamps, and minimum open-type wiring will be satisfactory and most IV = 34