0 ei > forces have to work upon is extremely small for the kind of buoys considered here. He can make some better calculations but thinks they will be safe. —_ Accuracy to which the barge oan be positioned was discussed in seme detail. The maximum wriation which LASL would like is 60 te 100 ft, because of the fast photography, the station for which will be on Arriikan, essentially perpendicular to the anchor. (The cameras we would like to use have a 40-ft field of view; it is doubted the barge can be positioned that well, On the other hand, should we have to go to cameras with a SO0eft field of view the experiment will have much less value.) As Narver pointed out, the cameras can be positioned after the barge is in place, and one does not care how much motion the barge has in the line of the cameras themselves, it is motien toward and away from the shore which is critical. Thaler and Walsh thought the barge could be positioned fairly accurately, but have not as yet caloulated this so have no firm nunbers. Walsh said it could be regulateds in order to position the barge one hooks on to one of the telephone buoys that are fastened to the deep moor. The closer the barge is to the telephone bucy and the less the cable, the tighter the barge is positioned. He added that in positioning submarines in shallow water the Navy use what they call a stretched moor, i.e., all lines are tightened, and he thinks at the moment this will probably be necessary here. If one does not do this, he does not think it can be pesitioned to better than 200 ft. Warver said Ha has looked into positioning in 180 ft of water, using the same principle. They used a line four times this depth, then 180 ft of chain to the anchor, so that the total length to the anchor was five times the depth of water. Their sinkers were lifted so as to stretoh the line and very good positioning was obtained by this method. Thaler will take the figure of 50 to 100 f for accuracy of Portecakes andt ry to work out their calculations on that basis. Ogle asked that they try to make it better if they can.) There are two questions, then, which it is felt need further investigations (1) How does one make sure the mooring does not get carried away, and (2) How accurately can the barge be positioned. The discussion then turned to time soales and assigmment of responsibility. It is LASL's feeling that since after all we could be in quite serious trouble from the point of view of the whole operation if this particular phase were to fail, we would like to see a test of it essentially just as soon as the barge can be put out there. This must wait until the moors can be fized and appropriate vessels 6 & eo