304 Transactions of the South African Philosophical Society. 



§3. Horizontal Intensity. 



In the case of the Horizontal Intensity the figures given by 



h 

 Sabine represent the value of the ratio tf , where h is the value of 



the Horizontal Intensity taking the lowest hourly mean of that 

 quantity for the month as zero, and H is the monthly mean 

 value of the Horizontal Intensity. Knowing H we can readily 

 obtain the daily inequality of the Horizontal Intensity to which 

 Wolf's formula — 



AH = A'H + rA"H. 



is applicable in the same way as in the case of the Declination. 



TABLE IV. 



AH. 



Unit ly. 



Cape of 



Good Hope 



Hour 



I. 



II. i 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



(Astro- 

 nomical). 





— -1 











+ 8-8 







— 5-0 







9+34 min. 

 5 



•4 



— -4 



— 1-8 



2-1 



— -1 



7-1 



5-6 



— 4-0 



•7 



X ! 



.8 



— 1-7 



•7 



— 1-9 



— 1-7 



— 1-1 



— 1-0 



2-0 



2-0 



1-0 



— 1-3 







2 



.5 



— 1-5 



1-0 



— 1-5 



— 2-6 



— 1-2 



— -6 



— 2-7 



— -8 



2-8 



•1 



— 1-5 



3 



•9 



— -9 



1-2 



— 2-0 



— -9 



•3 



•9 



— 3-7 



— 2-5 



2-2 



•5 



— 1-1 



4 



•3 



— -3 



1-5 



— 1-5 



1-4 



4-7 



3-1 



— 2-1 



— 3-5 



— -4 



— 1-2 



— -9 



5 







— -5 



— -1 



— 2-1 



•9 



3'8 



2-4 



— 1-2 



— 4-5 



— 2-7 



— 3-5 



— 2-2 



6 



2-0 



— 2-7 



— 3-5 



— 4-9 



— -8 



1-3 



— -4 



— 3-3 



— 7-3 



— 4-7 



— 4-6 



— 3-3 



7 



— 4-3 



— 4-9 



— 5-8 



— 5-7 



— 2-5 



— 1-8 



— 2-7 



— 6-2 



— 7'5 



- 5-7 



— 8-4 



— 7-1 



8 



— 5-6 



— 5-5 



— 6-5 



— 6-1 



— 4-9 



— 3-7 



— 4.1 



— 6-8 



— 8-3 



— 5-6 



— 6-2 



— 7-7 



9 



— 6-2 



— 5-0 



— 5-2 



— 5-9 



— 6-1 



— 4-9 



— 6-4 



— 7-2 



— 8-4 



— 5-3 



— 5-0 



— 6-1 



10 



— 5-5 



— 3-8 



— 5-0 



— 4-3 



— 5-2 



— 4-8 



— 6-8 



— 6-0 



— 6-3 



— 4-3 



— 4-2 



— 5-2 



11 



— 4-2 



— 2-8 



— 2-8 



— 2-3 



— 5-1 



— 4-3 



— 5-7 



— 5-1 



- 3-5 



— 2-9 



— 2-8 



— 3-9 



12 



— 2-3 



+ -2 



— 1-9 



— 5-0 



— 3-1 



— 4-2 



— 4-8 



— 3-9 



— 2-6 



— 1-6 



— 1-0 



— 3-4 



13 



— 2-1 



•3 



•7 



1-4 



— 2-3 



— 3'7 



— 3-2 



— 2-8 



— 1-0 



— -6 



— 1-0 



— 2-9 



14 



— 1-2 



1-8 



1-5 



1-7 



— 2-4 



— 3-5 



— 1-5 



— 2-0 



•5 



— -5 



•2 



— 1-7 



15 



•2 



1-6 



10 



3-1 



— 2-1 



— 2-2 



— 1-8 



— 1-5 







+ -5 



•1 



— 2-2 



16 



•7 



1-6 



1-6 



1-8 



— 1-1 



— 1-9 



— -6 



— -8 



•1 



+ -4 



1-4 



— -6 



17 



3-3 



2-0 



1-1 



2-2 



— -8 



— 2-0 



— -3 



— 1-3 



— -1 



1-6 



3-7 



2-9 



18 



6-1 



4-5 



3-5 



3-6 



1-6 



— -1 



1-4 



— -3 



•3 



4-4 



8-6 



7-4 



19 



7-9 



7-8 



7-5 



7-4 



5-5 



3-6 



4-6 



4-8 



5-5 



8-1 



2-0 



10-5 



20 



8-2 



7-2 



9-0 



8-2 



7-9 



8-0 



8-1 



9-9 



10-6 



7-7 



9-8 



11-7 



21 



4-1 



4-1 



5-0 



5-9 



9-6 



8-8 



8-8 



12-2 



13-4 



5-4 



5-6 



9-2 



22 



•8 



— -2 



— -1 



3-7 



7'6 



6-7 



7-5 



11-6 



12-2 



1-4 



•2 



4-6 



23 



•7 



— -2 



- 2-5 



•5 



4-7 



2-7 



4-9 



9-5 



7'6 



— -5 



— 1-5 



2-1 



