E. Loomis — Contributions to Meteorology. 



progress of storm centers, and the average direction of the 

 wind as shown by Coffin's wind charts. I have endeavored to 

 ascertain whether this correspondence is exact, or whether there 

 is a constant difference between these two directions. I first 

 made a comparison of these two directions for the Atlantic 

 Ocean. 



In order to determine the average direction of progress of 

 storm centers across the Atlantic Ocean, I measured with a 

 protractor the bearing of the storm tracks delineated on the U. 

 S. International charts. These bearings were measured for six 

 points, viz : at the intersection of the storm tracks with the 

 meridians of 10°, 20°, 30°, 40°, 50° and 60° west of Green- 

 wich, and the measurements included the observations of four 

 years, viz : 1878-1881. The following table shows the average 

 results of these measurements for each month of the year, and 

 for each of the six points above mentioned. The latitudes 

 named at the top of the table are the average latitudes corre- 

 sponding to the given directions. 



Average direction of Storm tracks. 



Long. 60° 

 Lat. 46-9° 



Long. 5U° 

 Lat. 48 9° 



Long. 40°. 

 Lat. 51-3°. 



Long. 30°. Long. 20°. Long. 10° 

 Lat. 53'9°. Lat. 54*9°. Lat. 5.V5 D 



January . . 

 February . 



March 



April 



May 



June 



July 



August 



September 

 October __ 

 November 

 December. 



N. 66° B. 

 66 

 73 

 63 



62 

 76 

 72 

 69 

 67 

 67 

 70 

 65 



N. 61° E. 

 67 

 69 

 68 

 67 

 63 

 . 62 

 74 

 72 

 64 

 67 

 66 



N. 64° E 

 60 

 68 

 72 

 68 

 64 

 59 

 74 

 78 

 72 

 62 

 62 



N. 74° 

 60 

 65 

 79 

 71 

 67 

 68 

 77 

 75 

 68 

 69 

 67 



Year N. 68 E.N. 67 E.N. 67 E.N. 70 E.N. 75 E.N. 79 E. 



N. 86° E 

 74 

 71 

 91 

 76 

 71 

 76 

 72 

 75 

 73 

 68 

 73 



N. 96° E. 



• 82 

 79 

 97 

 76 

 71 

 80 

 71 

 73 

 72 

 69 

 80 



I have determined the average direction of the wind at several 

 points on the Atlantic Ocean, as near as possible to the points 

 corresponding to the preceding measurements. I have deter- 

 mined the directions according to Maury's Pilot Charts, and also 

 according to the charts of the LT. S. Hydrographic Office. Since 

 the latter charts are based on the greatest number of observations, 

 I have used them in the comparisons exhibited in the following 

 table. The wind directions here given are deduced from the 

 observations for January, April, July and October. Along the 

 line of the storm tracks, the number of wind observations on 

 the charts is very small, and I have therefore deduced the wind 

 directions from the observations in the five degree squares a 

 little south of the average storm tracks. 



