38 



occupied during the season and on the post-season cruise are pre- 

 sented in the oceanographic table in this bulletin. 



On the post-season cruise 295 sonic soundmgs were made with the 

 fathometer. These have been corrected for sounding velocity by 

 means of the concurrently collected temperature and salinity data in 

 accordance with the temperature-saluiity-pressure-velocity relations 

 given in the British Admiralty tables (H. D. 282). The corrected 

 soundings have been tabulated and forwarded to the United States 

 Hydrographic Office and to the International Hydrographic Bureau. 



During the ice season, and in continuation of cooperation with the 

 Newfoundland Fisheries Research Laboratory at Bay Bulls, abstracts 

 of temperatures and salinities measured were forwarded to that 

 laboratory promptly upon the return of the General Greene to St. 

 John's at the conclusion of each survey. Other incidental data 

 collected on the General Greene consisted of barograms and sea-water 

 surface thermograms. The Ice Patrol has photographed the glacier 

 front in Arsuk Fjord, Greenland, during the summers of 1928, 1931, 

 1933 and did so agam in 1936. This year the various distances of 

 retreat and advance were measured by means of numerous horizontal 

 sextant angles taken from both ends of a 600-foot base line. The 

 results of these measurements have been forwarded to the chahman 

 of the committee on glaciers of the American Geophysical Union. 



The equipment and methods of measurement were the same as in 

 1935. Routine salinity bridge measurements were performed by the 

 oceanographer's assistants, Bernard S. Loebig, yeoman, first-class; 

 Edwin H. MacDonald, ciuartermaster, third-class; and surfman 

 James F. Flannery. The first-named performed the cahbration 

 titrations. 



At the 187 stations occupied during the season serial observations 

 of temperature and sahnity extended to depths of between 1,000 and 

 1,400 meters where the depth of water permitted. The levels from 

 which it was attempted to obtain measurements were 0, 25, 50, 75, 

 100, 150, 200, 300, 400, 600, 800, 1,000, and 1,400 meters. On the 

 post-season cruise the observations were carried to as near the bottom 

 as practical at all stations, the nominal depths of observations bemg 

 similar to those listed above from the surface down to 1,000 meters 

 and at 500-meter intervals below 1,000 meters. 



Both during the season and on the post-season cruise the ther-' 

 mometers, which were used in pairs, were occasionally shifted with 

 respect to each other so that each thermometer was eventually paired 

 with several other thermometers, thus furnishing a check against the 

 possibiHty of any thermometer or thermometers suffering a change of. 

 cahbration or ceasing to function properly during the period of ob- 

 servations. A total of 1,434 such comparisons were investigated. 

 Probable differences between the corrected readmgs of the pair of 



