440 The National Physical Laboratory* 



Table V. — Hourly Means of the Kew Vertical Force in C.G.S. units (corrected 



(The Mean for the 



Honrs. 



Preceding 



Mid. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 



10. 



11. 



noon. 





























0-43000 + 





Winter. 















1900. 





























Months. 





























Jan. . , . 



842 



845 



845 



845 



844 



844 



843 



843 



842 



841 



842 



842 



842 



Feb. ... 



828 



833 



832 



832 



832 



832 



831 



831 



830 



828 



829 



827 



828 



March . . 



842 



853 



853 



853 



853 



852 



851 



851 



852 



851 



850 



846 



845 



Oct. ... 



832 



846 



845 



845 



844 



844 



843 



843 



844 



845 



842 



840 



835 



Nov. . . . 



816 



819 



819 



819 



819 



818 



818 



818 



818 



818 



817 



815 



815 



Dec. ... 



801 



803 



803 



803 



803 



803 



803 



803 



802 



802 



800 



797 



799 



Means 



827 



833 



833 



833 



833 



832 







832 



832 



831 



831 



830 



828 



827 



Summer. 



April . . . 

 May . . . 



841 



858 



857 



856 



855 



854 



854 



853 



852 



851 



848 



844 



838 



823 



842 



841 



841 



841 



841 



843 



842 



841 



838 



834 



828 



823 



June ... 



818 



836 



835 



834 



834 



835 



835 



834 



836 



836 



833 



830 



826 



July ... 



821 



835 



834 



834 



833 



834 



834 



834 



835 



834 



828 



823 



816 



Aug 



777 



794 



794 



793 



792 



792 



794 



794 



793 



789 



784 



781 



775 



Sept. ... 



825 



836 



836 



836 



835 



835 



835 



837 



836 



834 



829 



824 



821 



Means 



817 



834 



833 



832 



832 



832 



832 



- 



832 



832 



830 



826 



822 



817 



Table VI. — Diurnal Inequality of the 



Hours | Mid. 1. | 2. 



3. 



4. 



5. 



! 6. 



7. 



8. 



9 . 10. 



11. 



Summer Means. 



! ! > 1 



+ -00003 + -00002: + -00002 + -00001 



1 1 ! i 



+ -ooooi 



+ *00002|+ -00002 



+ '00002 



•ooooo 



- -0000 J - -00009 - -00014 



1 



Winter Means. 



|+ -00001 |+ -ooooi |+ -ooooi 



+ -ooooi 



•ooooo -ooooo 



•ooooo 



- -ooooi 



- -ooooi 



1 



- -00002;- -00004 



1 



- -00005 



Annual Means. 



1 1 1 1 1 1 

 + -00C02 + -00002 j ¥ "00001 1 + -00001 + -00001 + '00001 



+ -ooooi ! 



+ -ooooi'- -ooooi I 



1 1 



- -00003 - -00006 



- -00009 



Note.— When the sign is + the 



