DISTURBANCES OP THE TOTAL FORCE. 



11 



Table XII.— Aggregate amount and number of Hourly Disturbances of the Total Porce 



FOR INCREASING 



AND DECREASING YalUES, 



Ratios, and Mean Effect of Disturbances. 1 













Ratio of sum. 







Hour. 



Sum. 



+ 





Sum. 







DifiFerencea of 



Average 

 diurnal effect. 



+ 



- 



. . . . 



.10570 



83 



.09163 



67 



1.22 



1.18 



+.01407 



+ .000011 



2 . . . . 



.08589 



68 



.11457 



80 



0.99 



1.47 



—.02868 



—.000022 



4 . . . . 



.08264 



66 



.11754 



82 



0.95 



1.51 



—.03490 



—.000027 



6 . . . . 



.08449 



57 



.08714 



64 



0.97 



1.12 



—.00265 



—.000002 



8 . . . . 



.06261 



48 



.07597 



58 



0.72 



0.97 



—.01336 



—.000010 



10 . 



.06364 



46 



.07327 



59 



0.73 



0.94 



—.00963 



—.000008 



Noon 



.07094 



51 



.07964 



64 



0.82 



1.02 



—.00870 



—.000007 



14 . 



.13083 



86 



.06866 



58 



1.50 



0.88 



+.06217 



+.000049 



16 . 



.08664 



66 



.06294 



50 



1.00 



0.81 



+.02370 



+.000018 



18 . 



.08880 



64 



.05094 



39 



1.02 



0.66 



+.03786 



+.000029 



20 . 



.08223 



60 



.04953 



37 



0.95 



0.64 



+.03270 



+.000025 



22 . 



.09791 



71 



.06286 



46 



1.13 



0.80 



+.03505 



+.000027 



The ratios of the mcreasing and decreasing disturbances appear to follow the 

 same law, that is, the values at any hour appear to be complementary to one another, 

 a high plus value corresponding to a low minus value ; the phenomenon is, however, 

 not so distinctly brought out as from the longer series at Toronto. The last two 

 columns contain the difference of the sums at each hour, and the average effect of 

 the larger disturbances of the total force. From 1 P. M. to 1 A. M. the larger dis- 

 turbances augment the total force ; from 1 A. M. to 1 P. M. they diminish it ; 

 greatest augmentation at 2 P. M., greatest diminution at 4 A. M. The greatest 

 augmentation is nearly twice as great as the greatest diminution, whereas at Toronto 

 the opposite effect was observed. 



The distribution of the disturbances of the total force, according to their magni- 

 tude for an equal increase of .00090 parts of the force, is as follows : — 







Between 



Number of disturbances. 



.00094 and .00184 



1324 



.00184 " .00274 



122 



.00274 " .00364 



17 



.00364 " .00454 



4 



.00454 " .00544 



2 



.00544 " .00634 







.00634 " .00724 



1 



beyond 



none 



