Fish Collections: Although attempts were made to fish from the TANEY, only sharks and flying fish were secured. Three yellowfin (or big-eye) tuna were purchased from a Chinese fishing boat near Moratai Island. Reef fish were collected by means of rotenone poisoning at Truk, Guam, Parece Vela (Douglas Reef) and Okinawa. All fish samples were subjected to radiochemical analysis. Scintillation Probe A scintillation probe was designed and built at HASL for continuous monitoring of radioactivity in sea water. A plastic phosphor, 3 in. in diameter and 30 in. long, was coupled to a 3-in. photomultiplier tube. The sensing element, circuitry and batteries were encased in stainless steel housing about 7 ft long. The signal was carried by a cable to an Esterline-Angus recorder, A special winch allowed the probe to be towed while on course. The assembly is sketched in Figure 4. The winch was mounted on the quarter-deck about 15 ft from the port side where the probe was put into the water. The controlling switches were mounted ona vertical plate attached to the rear of the winch so that the operator had a good view of the operation. The towing cable came off the drum of the winch to a davit extending 6 ft out from the side of the ship. This davit was rigged with a meter block through which the towing cable passed. The probe - : - =Owoannunsun— he SCINTILLATING CRYSTAL PHOTOMULTIPLIER TUBE ADJUSTING SCREWS FOR ZEROING AND SENSITIVITY AMPLIFIER CIRCUITS BATTERIES FOR HIGH VOLTAGE SUPPLY CONNECTOR AND HEAD WELDED STEEL CASING TOWING CABLE WINCH CONTROLS FOR WINCH ESTERLINE ANGUS RECORDING UNIT Figure 4. Assembly for the scintillation probe. was lowered vertically in the water to a depth of about 200 m. As the ship got under way, the probe rode horizontally near the surface of the water almost 200 m astern of the ship. Another davit was set up near the stern of the ship, outboard, to prevent the towing cable from fouling the propellers. Course and Itinerary On February 25, 1955, the US Coast Guard Cutter San Francisco for its survey of the Pacific, TANEY departed from The track is shown in Figure 5.