220 



RECORD AND RESULTS OF 



tlie annual fluctuation, the barometric height for each day was computed and sub- 

 tracted from the observed height at the hours 8 A. M., noon, 4, and ] P. M. These 

 differences (positive for greater, negative for less pressure than the normal) were 

 tabulated according to the direction of the wind. After balancing the resulting 

 average effect for the directions (true) N. E. and S. W., and for calms, it appears 

 that the barometric column is depressed about 0'°.07 during N. E. wind, and 

 elevated about 0'".04 during S. W. wind and during calms; at Van Rensselaer 

 Harbor the depression during N. E.-wind was 0'".01, and the elevation during S. W. 

 wind 0'°.04, and during calms O'^-Ol/ 



Oscillation of the Barometric Column diwing Storms. 



There are 25 storms recorded (see discussion of winds), during one-third of 

 which the barometer was notably affected; the range was between 0.3 and 0.9 ot 

 an inch. The readings of the barometer during the storms of November 9 and 10, 

 1860, of February 9, 1861, and of April 17, 1861, are illustrated by diagrams. 



24 6 8 10Mt24 6 8 10N24 6 8 10Mt24 6 8 10N24 6 8 

 inches November 9. November 10. 



30.8 



.7 

 .6 

 .5 

 .4 

 .3 

 .2 

 .1 

 30.0 

 29 9 

 .8 



"i i i i \ 1 i i i i i i \ i i r 



rn r ^[~i " i ■ i i i i 



\ 





<f .^ 





\ 



/\ 



/\ 



WIND /V.£. 



I I I I I I I 



WIND S.Vi. 



I I I I I I I I I I I I I I I I 



8 10 N 2 4 6 8 10 Mt 2 4 G 8 10 N 2 4 6 

 inches February fl. Febi-uary 10. 



30.0 



29.9 

 ■ 8 

 .7 

 .G 

 .5 

 .4 

 .3 

 .2 

 .1 



29.0 



LM I I I I I I I I I I I I I I I I 

 \ /"■■ 



\ \ <ic ; 



\ 



FORCE OF Wim. 



">>. 

 ^ 



c--'/ 



/ ;— • 



\. 



WIND N.E. 

 I I I I I I I I I I I I I I I I I I 



I I 



C33- 



I- 



^7- 



' See p. 108 of my Reduction of Captain McClintock's Meteorological Observations at Port 

 Kennedy and Baffin Bay. 



