288 



Direction of the Wiud, JVew Haven, Conn. 



6 A. M, was set oft' by means of a protractor (a vertical line upon the 

 paper being taken to represent the meridian), and a line half an inch 

 in length was drawn in this direction. From the extremity of this 

 line the wind's direction for 10 a. >r. was set off", and another line 

 drawn of the same length as before. In like manner were drawn the 

 directions for each of the honrs of observation. We thns obtain a 

 broken line, which may be regarded as representing the average 

 progress of a particle of air for each hour of observation through the 

 month of January, supposing the wind's velocity to be the same at 

 all hours. In like manner the curves for each of the twelve months 

 were constructed. 



Table IV, Part 1. — Differences hetiiieen the mean directions of the 

 'Wind at Neiv Haven, Conn., as determined hy the two series of 

 observations. 



6 A.M. 

 2 P.M. 

 6 P.M. 



Jan. Feb. Mar. Apr. May. Jane. Jnly. Aug. Sept. Oct. Nov. Dec< 



+ 10-8 +16-4 

 + 9-3 +16-9 

 + 9-21 + 18-4 



+ 6-6 

 + 17-0 

 - 7-5 



2-6 +28-1 

 - 9-1 —15-3 

 ■52-3 —62-2 



— 1-4 

 + 3-2 



— 12-8 



+ 21-5 

 + 5-3 

 — 261 



+ 30-8 

 -12-7 



-42-4 



+ 12-5 

 -25-5 

 — 20-1 



4-36-9 

 + 64-2 

 4-59-2 



4-16-7 

 4-16-6 

 -hll-1 



4-23-7 

 4-18-8 

 4-16-3 



Table IV, Part 2. — Differences between the mean directions of the 

 Wind at New Saven and W^allingford, Conn. 



If we compare the curves thus obtained for New Haven with those 

 given for Wallingford on Plate VIII, we shall find the results tolerably 

 satisfactory. A numerical comparison of the observations at the two 

 stations is given in Table IV, Part 2. For the month of October the 

 curves at the two stations show but little difterence, except that the 

 direction at Wallingford is on an average twenty-four degrees more 

 westerly than at New Haven. For the mouth of Noveml>er the two 

 curves bear a strong resemblance, the direction at Wallingford being 

 on an average seven degrees more westerly than at New Haven. For 

 the month of December the two curves bear a still closer resemblance, 

 but the direction at New Haven is on an average six degrees more 

 westerly than at Wallingford. Yoy January and February the resem- 

 blance of the two curves is equally strong, but the direction at New 

 Haven is sixteen degrees more westerly than at Wallingford in Jan- 



