CHAPTER II, SECTION 3 with station construction. The sub-base of the tower footings and the guy anchor blocks for Station 4 was below high tide level; construction work was therefore performed at low tides. During concrete placement, at least one foot of water was encountered even at low tide. A pump was used to keep the water at as low a level as possible. Power to these towers was supplied by two power centers. Each power center consisted of a primary disconnecting switch, a transformer, and a secondary circuit breaker distribution panel. Primary power was supplied by the island distribution system. Power center No. 1 had a capacity of 112.5 KVA with secondary distribution at 120/208 volt, 3-phase, 4-wire, and was used to supply the scientific requirements as well as general utilities; the total connected load was 106 KW. Power center No. 2 had a capacity of 150 KVA with the secondary distribution at 480 volt, 3-phase, 3-wire, and was used to supply the 50 HP elevator motor. The connected load consisted of the 50 HP motor only. The load divided between the two power centers provided the best voltage regulation for the scientific load, as the surge of the starting elevator motor was confined to the onecircuit and had noeffect on the scientific circuit. The use of the two power centers provided a second advantage in that the different voltages and number of wires could be adapted to the most economical use. Timing signals were installed for scientific purposes and for door and floodlight control. Signals were arranged to open or close the three electrically-operated doors in the cab and to shut off the tower floodlights. Signal cabinets, telephones, and extensions were provided at the base and in the cab. Coaxial cables were installed to the tower cabs and special supports for the cable runs were mounted at 12’-6” intervals on Stations 1, 3, 4, 6 and 7; for Station 2, a special messenger cable was used to run the cables to the cab. Station 5 was designed similar to other 300-foot towers and was built to the 75-foot level; completion was held in abeyance until the execution of the LaCrosse test (in accordance with User instructions). After the LaCrosse event, this station was deleted from the scien- tific program and was subsequently dismantled and returned to Elmerfor storage. All of the zero stations were located within second order survey (1:10,000) and tied into the primary triangulation network of Eniwetok Atoll. Concrete placed at each of the tower bases and at the four guy anchor blocks varied from 256 to 369 cubic yards. a“ Figure 2-30. Page 2-48 Station 2 with Station 3 in Background