maintenance shops, This specification was made a part of the published engineering maintenance procedure, and the equipment was provided, Submarine power cables between Runit and the tower site south of Runit and between Engebi and Muzin were designed for laying in a direct line along the reef between the sites. Power winches were used to pull the cable to Runit from the site south of Runit and to Engebi In this manner, considerable econamy both in materials from Muzin, and labor was achieved over the alternative method of laying cable from a barge out in the lagoon away from the reef, and adequate clearance from signal -ables was maintained, Transformers used were conventional oil filled single phase 2400/ 120/240 volt transformers with four 2-1/2 per cent taps. For the over- head systems, single transformers sized up to and including 37~-1/2 kva were mounted directly on single poles, Three-transformer banks (up to 25 each) were hung on cross-arms, and larger transformer banks were installed on two pole racks or concrete pads on grade. Transformers for both the utility (power and light) and the instru- mentation servises on experiment islands were standard oil-insulated, self cooled, outdoor distribution type. These were placed upon conerete pads at grade and enclosed by wooden fences. Instrumentation services included services required by the Users to energize scienti- fic instruments of all kinds, , Separate transformer banks were used for utility and instrumenta- tion loads at most locations in order to assure good voltage regulation for the instrumentation, This arrangement was considered necessary to meet the Users requirements of plus or mimus 1 to 2 per cent voltage regulation. At stations where the load was not large enough to warrant trans- formers, wooden power posts were installed which supported a raintight enclosure containing two or three-pole receptacles and a fused switch. These posts were supplied by 600 volt direct burial cables. Groups of power posts were supplied with secondary service from a centrally located transformer bank. Approximately 75 such posts were installed and, since in most cases they were considered expendable, they were held to a minimum design for low cost, Lightning arrestors were installed only on transformer poles and seem to have been adequate, for in two and one-half years no lightning damage has been noted, Services to buildings were installed as overhead drops wherever possible, Where distances were too great, where the function of the building or area prohibited overhead service, or where the load was too great, underground services were installed. Overhead services which would pass over other buildings were avoided wherever possible. 5-232