418 



Results of Makerstoun Observations, 1844. 



TABLE XVI.— Hourly Means of the Relative Humidity for each Month in 1843, 



Saturation being = 1. 



Mak. 

 M. T. 



Tan. 



Feb. M 



arch . A 



Lpril. 



May. J 



une. July. Aug. . 



Sept. 



Oct. ; 



Sov. 



Dec. 



h. 



12 



898 



903 



879 



883 



0-907 



910 



916 



912 



935 



901 



894 



949 



13 



898 



898 



883 



900 



■893 



909 



937 



921 



934 



901 



884 



948 



14 



897 



913 



888 



893 



•900 



922 



937 



920 



933 



906 



897 



948 



15 



915 



918 



887 



885 



•899 



930 



944 



927 



941 



906 



894 



948 



16 



915 



918 



885 



898 



•899 



903 



936 



934 



937 



905 



900 



953 



17 



932 



920 



894 



899 



•885 



893 



918 



929 



932 



894 



893 



953 



18 



924 



914 



893 



872 



•845 



869 



886 



901 



927 



898 



900 



958 



19 



916 



909 



906 



860 



•806 



827 



845 



877 



916 



892 



900 



948 



20 



926 



921 



878 



813 



•784 



795 



784 



843 



872 



873 



901 



948 



21 



927 



900 



826 



753 



•736 



775 



758 



788 



830 



845 



887. 



948 



22 



893 



852 



800 



706 



•714 



746 



732 



746 



801 



812 



873 



949 



23 



882 



823 



766 



684 



•674 



717 



701 



712 



766 



783 



860 



931 







857 



810 



753 



662 



•643 



735 



703 



679 



729 



750 



834 



924 



1 



859 



782 



725 



653 



•622 



714 



700 



676 



713 



746 



827 



907 



2 



851 



790 



721 



641 



•633 



717 



706 



683 



725 



736 



820 



915 



3 



863 



816 



720 



634 



•638 



740 



693 



699 



741 



753 



843 



927 



4 



872 



836 



737 



663 



•647 



742 



702 



701 



766 



785 



859 



944 



5 



885 



893 



777 



692 



•678 



769 



730 



741 



815 



828 



872 



929 



6 



894 



891 



812 



709 



•713 



803 



743 



794 



847 



844 



878 



938 



7 



889 



899 



846 



762 



•761 



820 



789 



842 



880 



871 



878 



938 



8 



893 



913 



862 



781 



•822 



846 



848 



892 



907 



869 



890 



943 



9 



897 



896 



868 



825 



•852 



872 



867 



894 



916 



884 



893 



938 



10 



896 



916 



883 



842 



•869 



889 



898 



914 



924 



884 



892 



948 



11 



901 



911 



883 



877 



•884 



899 



902 



893 



931 



884 



886 



943 



TABLE XVII. — Hourly Means of the Relative Humidity for each Astronomical Quarter, 



and for the Year 1844. 



Mak. 



Nov. 

 Dec. IV 



Feb. 

 ;arcb 



May 

 June 



Aug. 

 Sept. 



Year 



Mak. 

 M. T. 



Nov. 

 Dec. 



Feb. 

 March 



May 

 June 



Aug. 



Sept. 



Year 



M. T. 



Jan. x 



ipril. 



July. 



Oct. 



1841. 



Jan. 



April. 



July. 



Oct. 



1844. 



h. 

 12 



0-914 



888 



0-911 



0-916 



0-907 



h. 

 



0-872 



0-742 



0-694 



0-719 



0-757 



13 



•910 



894 



•913 



•919 



•909 



1 



•864 



•720 



•679 



•712 



•744 



14 



■914 



898 



•920 



•920 



•913 



2 



•862 



•717 



•685 



•715 



•745 



15 



•919 



897 



•928 



•925 



•916 



3 



•878 



-723 



•690 



•731 



•756 



16 



•923 



900 



•913 



•925 



•915 



4 



•892 



•745 



•697 



•751 



•771 



17 



•926 



904 



•899 



•918 



•912 



5 



•895 



•787 



•726 



•795 



■801 



18 



■927 



893 



•867 



•909 



•899 



6 



•903 



•804 



•753 



•828 



•822 



19 



•921 



892 



•826 



•895 



•883 



7 



•902 



•836 



•790 



•864 



•848 



20 



■925 



871 



•788 



•863 



•861 



8 



•909 



•852 



•839 



•889 



•872 



21 



•921 



826 



•756 



•821 



•831 



9 



•909 



•863 



■864 



•898 



■883 



22 



•905 



786 



•731 



•786 



•802 



10 



•912 



• 880 



•885 



•907 



•896 



23 



•891 



758 



•697 



•754 



•775 



11 



•910 



• 890 



•895 



•903 



•899 



Diurnal Variation of the Relative Humidity. — The relative humidity is a minimum from noon to 3 p.m. in 

 the different months of the year, occurring as early as h 40 m p.m. in August, and as late as 3^ 10 m p.m. in 

 November and April : it is a maximum in general about sunrise, though it varies little from sunset to sunrise 

 in the winter months. The following are the epochs of maxima and minima for each of the astronomical 

 quarters and for the year 1844 : — 



Winter. Spring. Summer. Autumn. Year. 



Max. 5 h 40 m a.m. 5 h 10™ a.m. 3 h 10™ a.m. 3 h 40™ a.m. 3 h 30 m a.m. 

 Min. l h 45 m p.m. 2 h m p.m. l h 10 m p.m. l h 30 m p.m. l h 35 m p.m. 

 The mean value of the relative humidity occurs at 8 h 40 m a.m. 

 7 h 12™ P.M. 



The interval between the periods of mean humidity = 10 h 32 m 



