VOL. Il BOOK 4 CHAPTER I SECTIONS 3-4 The use of "old age" Badger type 150 gph stills added to the maintenance work load considerably. Admiralty metal components, particularly the steara domes, had deteriorated badly through dezincification and these required continual repair. replacement. Spare units were kept in good operating condition for use as Continued vigilance for indications of leaks in the underground water systems was essential. Leaks in these systems ordinarily did not show on the surface due to the permeability of the coral formation of the Atoll. A study of the water consumption during the hours of midnight to 0400 generally disclosed whether a leak had developed. Leaks were located by isolating various sections of the system and testing hydrostatically. In addition to leaks in the underground piping, the west half of the concrete reservoir on Elmer developed leaks and had to be emptied and repaired twice during this operation. SECTION 4. MARINE With the acquisition of a floating dry dock in August 1951 and a Gilhoist in August 1952, the maintenance of bottoms, propellers and shafting of marine craft had been greatly facilitated. The all year round presence of the dry dock permitted docking of the heavier craft in a routine and orderly manner rather Figure 4-1, Gilhoist in Operation