Figure 2 shows in detail various conditions that existed during 

 the ice-observation cruise. The track of the Tampa, while on patrol 

 duty, is shown by a light line with arrows to indicate the direction of 

 her run. The isotherms are based on numerous radioed reports of 

 surface water temperatures from cooperating vessels, as well as on 

 the observations made by the Tampa. All ice sighted or reported 

 during the cruise is plotted. The figures appearing near the ice 

 symbols denote the dates of the reports or observations. 



THE FIRST CRUISE, "MOJAVE," FEBRUARY 27-MARCH 12 



In obedience to orders from United States Coast Guard headquar- 

 ters, the Mojav^e left Boston, Mass., on ice-patrol duty on February 

 23, 1930. The Tampa was met just west of the Tail of the Grand 

 Banks and relieved on February 27. Thereafter a close watch on the 

 southern limits of the ice was maintained, and all the usual ice- 

 patrol work was performed until the evening of March 12, when the 

 Modoc took over the patrol. 



Figure 3 shows in detail the distribution of ice and surface-water 

 temperatures during the cruise. Very few reporting vessels crossed 

 the Grand Banks north of the forty-fourth parallel. It is probable, 

 therefore, that considerable unreported ice existed between Flemish 

 Cap and the vicinity of Cape Race, Newfoundland. 



THE SECOND CRUISE, "MODOC," MARCH 12-26 



The Modoc departed from Boston, Mass., on International Ice 

 Patrol duty on March 9, 1930. She relieved the Mojave on March 

 12 and maintained the patrol in the usual manner until March 26. 



Figure 4 gives in detail most of the important patrol conditions 

 that prevailed during the second cruise. It can be noted that the 

 southern limits of berg drift pushed southward of where they were 

 during the preceding cruise. There was probably considerable un- 

 reported ice in the region between Cape Race and Flemish Cap, for, 

 as was the case during the preceding cruise, very few cooperating 

 vessels crossed the Grand Banks north of the forty-fourth parallel. 



THE THIRD CRUISE, "MOJAVE," MARCH 26-APRIL 10 



The Mojave carried on the third cruise between the dates noted 

 above, observing the ice and surface-water temperature conditions 

 depicted in detail in Figure 5. The southwestern limits of ice drift 

 temporarily retreated northward. To the eastward of the limits of 

 the ice patrol chart, however, one of the bergs that was followed 

 during the preceding cruise crossed the "B" United States-Europe 

 tracks. Very few cooperating vessels crossed the regions between 

 Flemish Cap and Cape Race, Newfoundland; once more, therefore, 



