TU 2 activities were coordinated closely with H&N con buildings and facilities was scheduled for 15 July, the scheduleddow eonThoseteatrune of the liquefaction plants being assembied, Test runs to assure smooth Operation of the plants and to train operators were performed as rehearsals for the production schedule beginain 6 24 August and were completed 28 October. During this period were delivered to Camco transport Dewars. In addition, purified gas and liquids were provided for TU 4 ag needed, Rehearsals for emergency operation in case of delay of the shot schedule were performed for each of the four liquefaction plants. Re-entry to the cryogenics area on Parry Island was possible on M+1 day. Test productions for each plant indicated no damage to the liquefaction units. After King Shot, dehumidification units were installed in the cryogenics buildings, and the interiors of the buildings were sealed. Periodic operation of the compressors and other equipment is planned in order to resist corrosive activity. It has been recommended that gas be circulated through the plants every 2 months to maintain oil films on moving parts of the compressors and vacuum pumps and that the plant be checked for leaks and general operational condition. 4.3 TASK UNIT 3, SPECIAL MATERIALS FACILITIES (Cambridge Corp.) The primary mission of TU 3 was to operate and maintain eight Dewar-refrigerator combinations at the Forward Area for Operation Ivy. This included the moving of the Dewars and refrigerators throughout the Forward Area as required by the operation schedule. This unit collaborated with TU 2 in Dewarfilling and delivered filled Dewars to the cabin con- + formance with the requirements of TU 4. The Cambridge Corporation of Somerville, Mass., during early 1952, designed the special hydrogen transport Dewars. These containers of necessity had to be capable of operation,fully loaded, over the highway system of the United States under long-haul conditions and, at the same time, capable of overseas operation and during loading on and off landing craft. As finally constructed, these huge Dewars, or vacuum bottles, each of 2000 liters capacity, were trailer mounted, weighed 49,000 lb, and were 35 ft long by 8 ft wide by 12 ft high. Each unit possessed its own helium refrigerator and power supply. The high vacuums necessary were maintained by vacuum pumping equipment which is a part of the Dewar-refrigerator combination. These Dewars were operated at Boulder, Colo., as a training for the Forward Area operation and at Los Alamos as a necessary part of the check-out of the Mike device Dewar and reflux system. Eight refrigerated Dewars were shipped to the Forward Area, The successful design, construction, and operation of De- wars of this size, within the short time available, were major contributions to the ultimate success of the Mike test. A shop building, approximately 100 ft long by 25 ft wide and equipped with a traveling overhead 20-ton crane, was provided in the cryogenics area to perform the necessary maintenance on the Dewar units. In addition there were seven lean-to buildings, approximately 20 ft by 40ft, for storage of Dewars between fill and transport. Fixed facilities on Parry were substantially completed by 1 August 1952. Four of the Dewars left Oakland on the USNS Pendelton on 2 August. The remaining four Dewars were ~ shipped via the USNS Merrill on 21 August 1952. These vessels arrived at Eniwetok approximately 12 days after sailing. The Camco shop in the cryogenics area was fully equipped and operating with the personnel on hand as of 15 August 1952. . Operation in the Forward Area consisted of manyfilling and transfer operations in co- ordination with TU 2 and 4. Movements of the filled Dewars on land and by boat were rehearsed carefully many times prior to the actual operational period. Operations of TU 3 were carried out very efficiently. , 56