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) 1929 Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. 1 958 929 900 917 920 908 960 942 901 913 949 933 965 942 915 931 952 892 923 966 949 923 950 929 2 943 929 901 906 940 939 942 884 890 930 898 946 941 924 934 951 966 985 941 958 937 930 943 952 3 932 950 932 894 909 934 864 906 928 933 862 929 962 960 914 937 976 969 1013 987 945 950 932 947 4 936 912 921 897 898 930 973 976 897 927 877 865 925 968 944 937 952 985 949 965 942 932 909 967 5 949 957 970 943 922 916 939 901 875 937 904 837 941 945 964 939 925 957 944 981 938 938 909 962 6 944 928 923 924 906 938 932 917 889 969 903 880 951 949 972 971 907 968 949 960 938 937 920 962 7 957 930 931 948 891 933 916 907 907 955 892 914 952 916 934 958 909 961 916 967 915 956 924 926 8 943 925 918 918 891 903 895 966 897 881 887 937 935 934 960 961 938 972 955 943 911 923 913 906 9 916 912 919 922 921 949 870 907 892 900 930 903 958 902 940 928 903 939 945 945 924 923 952 914 10 941 931 946 939 905 882 876 917 819 879 923 957 938 944 947 924 964 1016 979 968 915 922 913 953 11 953 930 946 924 893 902 920 963 836 910 902 942 975 923 959 950 938 957 933 1031 900 926 917 946 12 948 942 706 926 953 938 867 938 850 897 914 933 980 920 938 947 914 973 928 981 914 938 936 926 13 962 942 850 949 900 910 919 944 892 914 948 937 971 950 917 949 982 929 933 968 909 912 940 951 14 953 924 901 948 884 947 951 916 905 916 938 951 984 932 924 960 933 942 929 998 949 948 909 961 15 953 957 901 936 902 935 911 868 895 928 902 968 962 943 952 962 924 930 938 950 900 941 927 947 16 962 941 864 855 874 940 878 898 881 945 873 934 946 948 870 949 922 963 976 973 907 944 883 957 17 957 942 855 885 897 960 892 923 888 898 932 922 934 985 913 950 905 965 989 989 931 917 943 937 18 947 904 881 898 885 930 886 936 905 904 932 938 951 955 950 944 909 945 989 970 935 929 958 912 19 944 900 909 904 924 954 902 940 905 860 959 891 950 993 931 950 916 958 944 950 909 949 928 945 20 944 940 922 921 936 943 934 937 900 921 932 932 964 938 945 953 907 950 1001 973 931 898 945 939 21 935 951 887 940 918 950 941 930 900 896 937 918 941 940 903 947 926 976 934 979 916 924 977 921 22 947 939 883 916 923 909 902 927 895 904 960 931 924 948 958 922 964 986 961 1000 892 917 963 937 23 928 947 888 914 895 941 945 934 890 925 942 907 948 926 924 955 988 1005 952 998 914 926 934 900 24 921 952 907 910 876 924 945 905 911 924 970 927 949 962 924 929 973 959 1000 955 949 919 955 924 25 926 933 889 913 937 969 914 932 951 909 929 940 950 957 950 959 915 970 924 942 921 927 941 927 26 953 929 938 914 930 940 943 895 927 944 971 936 931 977 948 951 961 939 975 946 938 945 989 945 27 953 937 937 895 925 923 925 911 949 918 945 955 950 972 946 938 914 1006 954 947 927 936 957 884 28 937 856 949 935 938 939 950 886 924 921 938 941 953 944 941 976 936 1014 948 896 939 934 941 932 29 934 944 909 966 916 908 914 938 952 907 965 955 975 975 952 952 945 954 873 919 930 947 30 936 932 898 951 922 919 895 934 956 945 938 941 918 956 966 968 998 956 922 945 939 917 31 932 934 906 927 882 963 920 964 947 951 908 964 955 950 Mean 944 934 913 920 914 928 925 919 904 922 924 931 951 946 940 949 938 963 952 968 925 932 936 936