tions from paired protected and unprotected 

 deep-sea reversing thermometers. The salinity 

 of each seawater sample collected was meas- 

 ured with an RS-7A inductive salinometer 

 manufactured by Industrial Instruments Corp. 



All data were processed by a PDP-5 digital 

 computer manufactured by the Digital Equip- 

 ment Corp. The computer was programmed for 

 the correction of reversing thermometers and 

 the determination of thermometric depth, the 

 computation of sigma-t, specific volume anom- 

 aly and dynamic height integration, and the 

 computation of net and solenoidal volume 

 transport. 



The PDP-5 computer operated for a total 

 of 167 hours during both cruises with no major 

 troubles. At each station where only a Nansen 

 cast was taken, a Hytech Corp. electronic 

 bathythermograph (ELEBT) Model 480 Mod. 

 1 was first used to determine the vertical 

 temperature structure to 400 meters. This in- 

 formation was then used to determine the 

 sampling depths. 



A Geodyne Corp. toroidal fiberglass buoy, 

 equipped with a tripod mast, a Motorola Co. 

 X-Band radar transponder, Model SST-119X, 

 and an Edgerton, Germeshausen, & Grier, Inc., 

 Model 219-A interrupted quick flashing Xenon 

 light was used as a fixed reference for the 

 time series study of the volume transport of 

 the Labrador Current and the drogue current 

 study. The buoy was moored with a fixed 

 bridle, swivel, ballast ball, 96 fathoms of 1- 

 inch braided nylon line, 15 fathoms of '/a -inch 

 anchor chain, and a 75 pound Danforth anchor 

 in 34 fathoms of water at 44°37'N and 

 49°12.5'W. 



The radar transponder operated for 118 

 hours with no apparent degradation. The buoy 

 was acquired by the ship's AN/SPS-23 X-Band 

 radar at ranges up to 16,150 yards. The trans- 

 ponder was mounted approximately 5 feet 

 above the sea surface. It is of interest to note 

 that the setting and retrieval of the buoy was 

 accomplished without mishap under adverse 

 weather and sea conditions. The buoy operated 

 in 55 to 60 knots wind for at least 24 hours. 

 The Xenon light could be reliably sighted at 

 ranges under two nautical miles. 



The type drogue used is illustrated in Figure 

 4. These drogues were of a relatively unsophis- 



ticated but effective design. They were con- 

 structed using a bamboo pole for a mast and 

 two truck inner tubes for the flotation unit. 

 A standard surplus 24-foot aviator parachute 

 weighted with several links of anchor chain 

 (approximately 30-50 pounds) was suspended 

 using a V4-inch black polypropylene line. The 

 inner tubes were lashed in place several feet 

 from the bottom of the pole. Daytime identifi- 

 cation was provided by orange fluorescent 

 vinyl-coated nylon flags. These flags were pur- 

 chased with wood stifi'ners that aided daytime 

 identification. Nighttime acquisition in the 

 visible spectrum was provided by a 6-volt DC- 

 filament flasher bulb. A standard lifeboat 

 corner radar reflector was used for nighttime 

 acquisition under adverse weather conditions. 



Prior to the 1967 Ice Patrol Season a Bissett- 

 Berman Model 9006-N Salinity/Temperature/ 

 Depth Measuring System (STD) provided by 

 the Navy Oceanographic Oflfice was installed 

 aboard the CGC EVERGREEN by the Coast 

 Guard Oceanographic Unit to gain operational 

 experience with the instrument. This instru- 

 ment was designed for operation to 1500 

 meters. The STD was inoperative during the 

 entire first cruise. After returning to Boston, 

 the STD was checked and found to have a de- 

 fective mixer and salinometer. Both were re- 

 placed and the STD was given a one-day test 

 at sea to make certain it was operational. 



The starboard oceanographic platform was 

 modified by CGC EVERGREEN to increase its 

 height to facilitate handling the STD under- 

 water equipment rack and associated sensors 

 during launching and retreiving. The modified 

 "A" frame was given a 1020 pound static dead 

 weight test. After passing the static test, a 

 test lowering was conducted using a 410 pound 

 ballast ball. 



For comparison purposes duplicate Nansen 

 and STD casts were planned for the upper 

 1500 meters at each station in Standard Sec- 

 tion 4. At station 9552 the STD failed to op- 

 erate when placed in the water. For the 

 remainder of the second cruise the STD opera- 

 tion was intermittent. Operation could gen- 

 erally be restored by reterminating the sea 

 cable and/or regreasing the Marsh-Marine con- 

 nector that coupled the multi-stranded conduc- 

 tor of the sea cable to the mixer unit on the 

 underwater equipment rack. During the 1966 



