underground exhaust line, Early in January 1950, the Bogallua experi~ ment was cancelled and work on the plans for the power plant was stopped, although the development of these drawings was quite well along. A change in plans by the J-Division again activated Bogallua as a test site early in the summer of 1950, and Holmes & Narver was authorized to investigate a new design for power plant at this location, The design requirement was that the entire power plant equipment was to be housed in a wood frame building above ground, the major equipment to consist of two 195 kw diesel generating units, three 85-gallon per hour distillation units, two 100-gallon per minute fresh water pumps, two 300-gallon per minute salt water pumps, and a hydrochlorinator, All of this equipment was to be expended because the tower location selected at this time, near the center of the island, made the cost of a blastproof structure prohibitive. Drawings were started for this plant during the latter part of July, but Bogallua was again abandoned as an experimental site in early August 1950, and all work on the power plant was cancelled. Bokon Island, Piiraai Island, and Teiteiripucchi Island (Photo Tower Locations). Based upon AEC furnished criteria, the estimated load for Bokon, Piiraai, and Teiteiripucchi was between 40 and 50 kw maximum power demand each, Two 50 kw units was installed at each lecation, One was ample for capacity load; the other was to act as a standby unit, No changes were made in power requirements for these sites, Palmer 6~cylinder 50 kw units were selected, based upon Engineering Division review of available equipment. This decision was concurred in by Los Alamos. At each photo tower site, these units were housed in a wood frame shelter. Fuel was supplied in 50 gallon drums and the units were serviced periodically by Holmes & Narver maintenance personnel, The units were capable of operating unattended and they functioned satisfactorily during test operations. TESTS AND OPERATION OF UNITS After the initial 200 hours of operation the crankshaft in genera- tor unit No, 1 at Parry broke. eyclinder, 142 kw set. This unit was a Fairbanks-Morse, 6- The broken shaft was replaced and, after an additional 15 hours of operation, it broke, Both broken crankshafts were sent to the Fairbanks-Morse factory for inspection to determine the cause of the failure. It was determined that excessive vibration, occurring at a value of engine speed within the normal range of operation, was the cause, Torsional wheels to act as vibration dampeners were installed on this unit and on all other similar 6~cylinder units and no further trouble was experienced. Telemetering equipment was installed to indicate and record remotely at control building No, 311, Parry Island, the bus voltage at the electric generating power plants (Station No. 100) on Runit, Aomon, and Engebi, the line voltage at the control stations (No, 69) on these same sites, and the generated voltage at the isolated generator plants on the photo tower locations, Esterline Angus standard model AW instruments were used, calibrated to measure voltage from 85 to 135 volts with full scale deflection, The accuracy of the units was proved to be, 5-216