Using the lessons learned during the first lift attempt, a new aluminum toggle was fab- 

 ricated and a different method of insertion and lift line connection was planned for Lift 

 Attempt No. 2. The basic structure of the new toggle was identical to the first except that: 

 (1) the aluminum pipe was covered with aluminum angle to form a square section so that 

 ALUMINAUT could grasp the toggle bar handle at any point; and (2) syntactic flotation 

 material was placed on one side of the handle. Only high density material (39 Ib/cu. ft.) 

 was available. This increased the maximum toggle bar dimension to 16 inches requiring 

 skillfull handling through ALVIN's 20-inch hatch. 



A 25-foot nylon line with a snap hook on the end was attached to the toggle. The snap 

 hook was designed to be snapped onto the ring on the lower end of the lift line. It was 

 planned that the toggle bar would be the only lift device, and that the stern hook, designed 

 for use in the first lift attempt, would not be used. The toggle would be carried on a light 

 boom fastened to ALUMINAUT's bow, leaving both of ALUMINAUT's manipulators free 

 to assist in holding ALUMINAUT in position and securing the toggle in ALVIN's sphere. 



DIVERS AND DIVING EQUIPMENT 



Three First Class Divers were obtained on loan from Naval Underwater Weapons Re- 

 search and Engineering Station, Newport, Rhode Island. The use of SCUBA equipment was 

 not permitted because of the nature of the dives and the desirability of having communica- 

 tions between the diver and his tenders during tedious work. As no standard Navy diving 

 equipment fulfilled the requirements for both mobility and communications, permission 

 was granted by the Supervisor of Diving, U.S. Navy, to use commercial equipment to fulfill 

 the requirements. The Kirby-Morgan KMB-8 Band Mask, Gates 3/8-inch diver's air hose and 

 commercial divers telephones were chosen. This equipment had been extensively tested at 

 the Navy Experimental Diving Unit prior to its operational use. A standard portable 125- 

 CFM Ingersoll-Rand diesel-driven diver's compressor was used as the air supply. 



RECOVERY WINCH 



This winch was built for WHOI to lower ALVIN for an unmanned dive to 7,500 

 feet in 1965. It was a double traction winch, each drum powered separately by a synchro- 

 nous 10-hp motor through a reduction gear and chain drive. This winch was bolted to 

 foundations welded to the deck of MIZAR. 



Because chain failure was experienced during system testing at Boston Naval Shipyard 

 and again during lowering of the clump, some question arose as to the reliability of the winch. 

 However, after a chain cover was fabricated and placed over the chain to keep foreign mater- 

 ial away from the chain and sprockets no additional failure was experienced. 



53 



