8386, located off the Nugssuag Peninsula of Greenland. After taking 

 the last station, on 28 July, the Evergreen proceeded to Woods Hole, 

 Mass., arriving on 6 August. Some time was lost because of heavy 

 pack ice off the coast of Baffin Island at Loks Land, Cape Dyer, and 

 Cape Henry Kater but no time was lost due to bad weather. There 

 were some slowdowns because of heavy fog in areas known to contain 

 icebergs and growlers. 



The oceanographic work was under the supervision of oceanog- 

 rapher Alfred P. Franceschetti who was assisted by Lt. R. M. 

 O'Hagan and Lt. V. W. Driggers. Other assistants in the observa- 

 tional work and reduction of data included R. C. Norris, aerographer's 

 mate chief; F. N. Brown, yeoman first class; R. A. Lindsay, aerog- 

 rapher's mate second class; J. A. Senefelder, aerographer's mate 

 third class and R. F. Hansen, aerographer's mate third class. 



Temperature and salinity observations were made at each of the 

 436 stations. At the 87 stations included in the Labrador Sea, Davis 

 Strait and Baffin Ba}^ sections, the observations extended from the 

 surface to as near the bottom as was practicable. At the remaining 

 stations, the observations were limited to the upper 1500 meters. 

 The intended depths of observations in meters, were 0, 25, 50, 75, 

 100, 150, 200, 300, 400, 600, 800, 1000, and thence by 500 meters 

 intervals. 



Temperatures were measured with protected deep-sea reversing 

 thermometers, mostly of Richter & Wiese manufacture, but with some 

 manufactured by Xegretti & Zambra, G.^L Manufacturing Co. and 

 Kahl Scientific Instrument Corp. Depths of observation are based 

 on unprotected reversing thermometers made by Richter & Wiese 

 and by Kahl Scientific Instrument Corp. As in previous years, a 

 program of intercomparison of protected thermometers was carried 

 out in the field measurements. The thermometers were used in pairs 

 and one of each pair was shifted periodically so that a given ther- 

 mometer eventually was paired with a number of other thermometers. 

 From a total of 3,019 intercomparisons, the standard deviation 

 between the corrected readings of a pair of protected ther- 

 mometers was ±0.009° C. Of these comparisons, 2,645 involved 

 thermometers having a range of —2° to +8° with a standard devia- 

 tion of ±0.009° C, 294 comparisons between thermometers of range 

 — 2° to +20° or greater gave a standard deviation of ±0.014° C. and 

 76 comparisons were between thermometers with a range of +3° to 

 + 13° and gave a standard deviation of ±0.007° C. As most of the 

 observed temperatures listed in the Table of Oceanographic Data are 

 means of the corrected readings of a pair of thermometers and as 

 many of the thermometers had recent ice point determinations, it is 

 considered that the tabulated observed temperatures are good to 

 ±0.01° C. 



31 



