Vol. XIII. No. 2 THE HORIZONTAL COMPONENT OF MAGNETIC INTENSITY AT OSLO OBSERVATORY 1843-1930 9 O'Clock H = 15000+ 14 O'Clock H = 15000+ (9999 = No data) 1873 Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. 1 901 903 921 909 894 884 914 925 916 908 943 946 907 913 907 921 913 895 989 956 968 937 939 952 2 916 900 907 867 905 923 942 953 927 927 890 952 926 919 918 944 911 952 987 962 977 935 946 950 3 927 905 902 898 903 928 935 942 939 933 942 960 936 900 918 876 920 954 957 966 958 927 949 957 4 896 897 918 896 904 900 951 952 960 925 939 965 927 908 914 911 936 957 960 952 953 930 945 964 5 914 915 895 896 911 930 953 972 950 897 946 957 932 914 891 924 918 974 967 916 947 954 845 964 6 907 910 895 885 914 939 936 917 921 935 965 963 908 906 900 923 924 974 983 914 946 957 943 963 7 909 911 893 865 917 930 937 928 930 945 930 965 896 907 930 894 948 957 995 1003 981 940 939 977 8 869 928 887 902 881 923 965 927 909 945 947 953 912 918 942 918 931 947 987 965 966 940 942 946 9 865 932 719 896 896 924 965 932 934 940 942 957 897 945 936 912 948 947 995 927 974 934 947 938 10 909 904 840 882 946 930 942 942 925 929 950 950 915 907 885 931 952 923 990 1000 959 935 953 930 11 931 922 885 891 928 926 936 929 939 888 942 950 902 892 886 942 941 956 975 965 960 933 943 946 12 906 896 902 867 916 919 940 915 926 926 917 950 943 909 897 915 944 988 989 951 944 948 939 959 13 908 906 900 886 925 907 935 913 916 924 926 950 915 921 947 945 981 948 996 932 946 938 909 946 14 918 898 890 881 904 908 941 924 905 925 918 947 925 904 906 915 935 963 968 953 960 940 912 940 15 918 916 894 883 910 910 917 932 936 929 924 925 927 915 922 923 922 969 938 953 943 951 916 939 16 929 905 879 892 892 928 942 935 927 898 933 936 932 936 895 944 902 932 971 980 943 927 926 940 17 929 912 907 912 868 935 898 940 928 925 939 944 922 914 931 928 925 948 1008 953 953 923 932 953 18 926 920 889 921 874 943 933 917 923 916 942 948 930 919 893 980 912 958 1015 952 942 937 941 952 19 917 923 897 873 897 927 941 1137 950 919 965 947 985 918 903 963 937 955 993 980 932 941 949 947 20 911 909 885 839 869 921 940 917 922 925 942 950 870 923 903 921 921 993 1034 975 934 929 954 948 21 917 901 903 878 892 942 929 920 919 946 938 950 914 917 906 974 923 971 984 948 936 947 951 937 22 922 903 889 868 898 957 1126 927 924 916 933 950 923 907 931 896 933 940 998 946 929 928 913 946 23 918 870 929 873 910 937 922 942 909 933 940 960 927 931 921 932 922 962 1013 975 957 933 941 960 24 906 887 881 893 868 950 926 890 929 927 945 942 939 913 906 916 910 1003 966 1017 933 935 937 942 25 886 902 892 887 907 958 942 915 925 936 947 942 930 903 914 921 941 1012 988 949 898 927 923 948 26 893 900 874 867 913 934 934 909 930 934 932 953 923 907 931 896 954 962 963 943 923 908 932 964 27 884 886 886 883 909 881 944 912 924 930 934 944 912 913 923 933 949 982 985 937 914 939 930 948 28 901 877 894 896 910 898 930 921 920 940 939 945 911 906 913 939 934 966 984 955 926 942 942 958 29 891 886 900 900 939 949 924 933 930 951 942 921 923 926 921 931 983 998 943 941 960 932 30 896 881 896 911 940 946 979 919 942 947 944 908 901 923 915 953 972 966 916 938 951 950 31 896 877 931 961 915 934 947 906 915 939 965 960 944 954 Mean 907 905 894 886 903 926 938 927 927 927 938 949 920 914 913 922 929 959 982 958 945 937 938 950