added operational convenience of having conductors in pairs, it was suggested that two-conductor nonmetallic sheathed cable be used instead of single conductor wires. The use of multiconductor cable was considered economically unjustifiable. It was suggested that cable be obtained on large reels rather than in 250 foot coils, in order to minimize the nunber of splices required, In a series of conferences ending May 17, 1950, the requirements for control and signal cable on Engebi, Muzin, and Kirinian were firmed up, and total requirements for all sites were estimated to be between 800,000 and 1,200,000 lineal feet of two solid conductor lj-gauge cable. This cable was required for runs emanating from Station 69 on each experiment island, to be laid in trenches from these stations to various stations on these and other sites. On June 15, procurement was requested of 1,200,000 feet of two conductor, l4-gauge parallel conductor solid copper, 600 volt nonmetallic sheathed cable with an insulation of thermoplastic compound moisture resisting type TW or equal, in 5,000 foot reels (500,000 feet) and 10,000 foot reels (700,000 feet} and of 30,000 lineal feet of conductor, 14- gauge solid copper, 600-volt cable with an insulation consisting of poly~ ethelene on conductors and polyvinyl-chloride on the outer jacket on 5,000 foot reels. Bids on the nonmetallic sheathed cable were received on June 21 and acceptance of the low bids recommended on June 26, 1950. Prior to the receipt of bids, J~Division advised that additional cables would be re-~ quired between Station 69 and zero points on each island and specified 20~conductor No. l4-gauge copper wire cable for this purpose. The quantity of 20-conductor cable required was increased to 35,000 lineal feet on July 11, 1950, and the acceptance of the low bid was recommended on July 12, On August 7, 1950, it was necessary because of the scarcity of polyethelene to permit the substitution of polyvinyl-chloride insulation to expedite delivery of this cable. There were continued changes in the underground control and signal cable requirements until approximately December of 1950. included; These changes 1. The installation of an 8-pair cable for intercommnication between Buildings 311, 209, 221, 324, and the boat dispatcher's quonset, all on Parry Island. 2. The installation of a 2—pair cable between Buildings 311, 209 and 221 on Parry Island, for sound powered telephones, 3. The installation of an 8-pair cable between terminations of unloaded pairs of cables 0-104 and 0-105 at the main frame in Buildings 208 and 311 on Parry Island. 5-252