188 



RECORD AND RESULTS OF 



True direction of 

 wind. 



Port Foulke 

 <(> = 780 18' 



Van Rensselaer 

 .f = 780 37' 



x=73 00 



\ = 70 53 



N. 



+ 0O.8 



— 10.4 



N. E. 



_2.4 



0.0 



E. 



— l.G 



—0.1 



S. E. 



+ 1.9 



+ 0.9 



S. 



+ 1.3 



+ 0.6 



s. w. 



+ 0.7 



+ 0.4 



w. 



—0.1 



+ 0.1 



N. W. 



—0.8 



—1.4 



We have, therefore, for comparison the following expressions' : — 



Port Foulke . . . . t = + l°.2 sin (e + 2id°) + 1°.2 sin (2e + 126°) 

 Van Rensselaer Harbor . . f = + 1.0 sin (e + 286 ) + 0.3 sot (29 + 335 ) 

 Baffin Bay (f = 12°.5, ^ = 650.8) * = + 1.5 sin (e + 338 ) + 0.8 si7i {2e + 173 ) 

 Port Kennedy . . . . r = + 0.9 sin (e + 320 ) + 0.4 sin (2e + 26 ) 



The angle 6 counts from the north (or belongs to a true north wind) in the 

 direction east, south, etc. 



Effect of a fall of Snoio (or Rain) on tlie Temperature. 



The effect produced by the change of latent into sensible heat, during the pre- 

 cipitation of snow (or rain), is far greater than the effect of the variation in the 

 direction of the winds. 



At Port Foulke it snowed on 94 days in eleven months ; the total number of 

 hours of precipitation during this time was 656. It rained on 15 days in June, and 

 July, and November ; total number of hours 79. This is considerably more snow 

 and rain than at Van Eensselaer Harbor, where Dr. Kane noted snow during 680 

 hours, and rain during 60 hours, in seventeen months. The snowy and rainy days 

 are distributed over the year as follows; — 



In September . 



. 6 



" October 



. 10 



" November . 



. 12 



" December . 



4 



" January 



. 8 



" February 



. T 



In March . 



. 8 



" April . 

 " May . 

 " June . 



. 8 

 . 9 

 . 16 



" July . 



. 13 



The elevating effect on the ivinter temperature is as decidedly brought out as the 

 depressing effect on the summer temperature ; the former, however, is six times as 

 great as the latter. If we compare the observed temperature (at the hours 2 A. M. 

 and P. M., and 8 A. M. and P. M.) with the corresponding normal temperature 

 during each fall of snow (or rain) according to the method pursued in the preceding 

 investigation, we find from 85 cases in the winter half of the year (October to 

 March inclusive) the elevating effect on the average = 8°. 6, and from 86 cases in 

 the summer half of the year (April to September) the depressing effect on the 

 average 1°.5; during the whole period, therefore (in 11 months), the average effect 

 was +3.°5; at Van Rensselaer Harbor the corresponding quantity Avas +7°. 7. 



* S.ee p. 30 of reduction of Sir F, L. McClintock's Meteorological Observations. 



