qn (Ogle had mentioned in discussion of anotherproject the large _ hichmust be DELETED planned for, | DELETED __. / The instrumenta- ‘tion must be planned with enough range to go from 100° KT to 4 MT.) Getting pressures at distances of interest to submarines is achieved by putting the muges at different depths, since the pressures increase with depth of water. The instrument lines will be in a position roughly as shown in the sketch relative to the weapons barge. Three lines will be used, to achieve distances of 6780 or 7500 ft (depending on the weapon chosen). 10,000 and 16,000 f% from zero. 4 1 I ' DELETED —_ ot Z Weapons Barge FETED ELE [The moorings planned will position these to several t——— hundred feet. meee It is thought that a 1-1/2" chain should be sufficient to go from the moorings to the water. Then a 1/2" wire cable with breaking strength of 28,000 lbs will be adequate from the cable to the buoys. chain A deep sea moor will be put down to'a 2800 1b anchor with a 1-1/2" leader. The instrument cans will be fastened to this system. It 4s planned to use a net layur and a tug, the former to lay the moors, the latter the cans.. As for the pressures expected, there are practically no data available on largeescale surface bursts, so they have taken smallescale data and attempted to scale it up. This has resulted in the predictions noted below for instrumentation at depths of 75, 260, 600 and 1000 ft, as shown in the sketch. the buoys. All instruments are self-recording on magnetic tape within In addition, it is planned to telemeter the information from the Sechannel Wiancko system.at 10,000 ft. They had considered telemotering by a remote-controlled relay station on Eniwetok to a manned. aircraft which would have a recording station in it. (Photographic _ recording would be used forthis phase.) The aircraft also has a comand i