Deck 



Name 



Inclusive Dates 



Number of Obs 



110 



Navy-Marine Obs. 



19^5-51 



79,444 



116 



U.S. Merchant Marine Obs. 



1949-60 



353,216 



117 



U.S. Navy Marine Obs. 



1952-61 



254,626 



318 



Japanese Marine Obs. 



1937-53 



508, 082 



119 



Japanese Marine Obs. 



1953-60 



386, 283 



184 



British Marine Obs. 



V53-6/56 



131,479 



187 



Japanese Whaling Fleet 

 Obs. 



1946-56 



574 



189 



Dutch Marine Obs„ 



12/39, 9/45-6/55 



183,159 



192 



German Marine Obs. 



1859-1939 



879, 086 



193 



Netherlands Marine Obs. 



1854-1938 



2, 585, 262 



19^ 



British Marine Obs. 



1856-1953 



1,005,270 



195 



U.S. Navy Ship Logs Obs. 



1942-45 



81,177 



197 



Danish Marine Obs. 



1860-1956 



455 



281 



U.S. Navy Monthly 

 Aerological Record 



1920-45 



19,236 



TOTAL 



6,467,349 



On the mean charts the machine utilized all available data, whereas 

 on the minimum and maximum charts the machine was instructed to omit 

 data for squares containing fewer than 10 observations. Because of the 

 inherent error in injection temperature data, minimum temperature was 

 taken as the first temperature class interval for which frequencies 

 equal or exceed 2.5 percent of the data, while maximum temperature was 

 taken as the first class interval that equals or exceeds 97.5 percent 

 of the data. 



As the temperature values on the minimum and maximum charts were 

 plotted for class intervals of 1°F. each, and therefore as whole numbers, 

 the analysis was necessarily different from that of the mean charts, 

 where the plotted values were carried to one decimal place. The method 

 of analysis was intended to show the maximum intrusion of extreme 

 temperatures. The minimum isoline was drawn on the warmer border of 

 the temperature class interval, whereas the maximum isoline was drawn on 

 the colder border of the temperature class interval, as shown in the 

 following example: 



Minimum 



39 



39 39 



4o 



39 



39 39 



40 



40 



40 4o 



4o 



40 



40 40 



4o> 



40y 



^ 



\ \ 



40° 





Maximum 



40° 



39 



39 



39 



'40^ 



39 



39 



3 y. 



30- 



""40" 



Jo. 



-40' 



"4o^_ 



ko^ 



-40' 



"40" 



Jo- 



^40 



^ 



,4l' 





40° 



