— Bathythermographs were taken at fixed stations, no pear was available for underway measurements. These measurements, of great value in establishing the state of mix of the uover layers, were greatly augmented by BT's sent in from DDE which had been steaming in nearby areas. A very interesting demonstration of the radioactivity concentrating ability of marine life was made. Two plankton casts were made in water of “measured activity and the organisms were found to be many times more active “than their medium, _ wet = ¢ Navigation during the later phases was largely determined by the -™ ve outcome of the intensity monitoring. The length of the trip was not limited * | by the ability of even this improvised gear to detect radioactivity but rather by the ability of a single slow-moving ship to traverse significant water surfaces before these broke up into eddys md moved out of reach. The ship returned on schedule, all gear intact. Measurements Made The planner puerents procedure, and personnel are itemized in the original «ile: ompleted by Revelle, Isaacs and Folsom and circulated on 27 April by Task Unit 13. PRRTREpETeorERueTIIIE eer er wes eiews os - . Actual measurements (BBM re modified slightly to fit field Circumstances which then existed. HycGrographic Stations Eicht positions (see Fie. 2.7-1). One cast to 0, 50, 100, 150, 200, 500, 800 meters. Four casts to 0, 25, 50, 100, 200, 500 maters. Four casts to 0, 25, 50, 100, 175 maters. Dual protected thermometers at all depths. _ thermometers available). “ | quay -36- (No unorotected y