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) 1876 Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. Jan. Feb. Marz Apr. May June July Aug. Sep. Oct. Nov. Dec. 1 989 986 965 962 970 965 9999 9999 9999 9999 9999 9999 985 981 976 964 974 995 9999 9999 9999 9999 9999 9999 2 985 987 967 968 976 965 9999 9999 9999 9999 9999 9999 971 981 966 973 979 986 9999 9999 9999 9999 9999 9999 3 986 991 972 968 980 975 9999 9999 9999 9999 9999 9999 981 989 976 977 983 984 9999 9999 9999 9999 9999 9999 4 982 989 970 972 975 975 9999 9999 9999 9999 9999 9999 985 984 982 979 988 998 9999 9999 9999 9999 9999 9999 5 980 978 962 977 973 969 9999 9999 9999 9999 9999 9999 977 980 968 966 997 993 9999 9999 9999 9999 9999 9999 6 983 965 985 873 974 973 9999 9999 9999 9999 9999 9999 983 978 982 1001 992 996 9999 9999 9999 9999 9999 9999 7 978 978 976 981 975 971 9999 9999 9999 9999 9999 9999 977 975 971 984 994 1002 9999 9999 9999 9999 9999 9999 8 976 972 986 978 955 975 9999 9999 9999 9999 9999 9999 983 963 976 976 980 997 9999 9999 9999 9999 9999 9999 9 979 975 977 966 958 983 9999 9999 9999 9999 9999 9999 973 981 985 982 976 996 9999 9999 9999 9999 9999 9999 10 976 976 978 972 972 977 9999 9999 9999 9999 9999 9999 973 970 990 977 984 1004 9999 9999 9999 9999 9999 9999 11 983 982 984 967 971 981 9999 9999 9999 9999 9999 9999 973 969 1010 977 979 1033 9999 9999 9999 9999 9999 9999 12 985 980 981 973 969 961 9999 9999 9999 9999 9999 9999 982 966 987 976 992 1002 9999 9999 9999 9999 9999 9999 13 983 984 979 963 967 996 9999 9999 9999 9999 9999 9999 971 985 994 953 977 1012 9999 9999 9999 9999 9999 9999 14 975 975 975 960 975 996 9999 9999 9999 9999 9999 9999 984 971 983 975 987 1020 9999 9999 9999 9999 9999 9999 15 967 970 976 972 972 991 9999 9999 9999 9999 9999 9999 973 975 991 974 992 1019 9999 9999 9999 9999 9999 9999 16 981 971 982 971 965 997 9999 9999 9999 9999 9999 9999 976 964 978 990 998 1010 9999 9999 9999 9999 9999 9999 17 976 978 977 963 970 984 9999 9999 9999 9999 9999 9999 984 964 973 978 975 1027 9999 9999 9999 9999 9999 9999 18 979 980 976 953 968 981 9999 9999 9999 9999 9999 9999 996 964 971 973 981 1015 9999 9999 9999 9999 9999 9999 19 999 977 973 984 961 985 9999 9999 9999 9999 9999 9999 993 983 977 968 984 1001 9999 9999 9999 9999 9999 9999 20 983 983 981 942 964 1001 9999 9999 9999 9999 9999 9999 982 957 975 981 1000 1021 9999 9999 9999 9999 9999 9999 21 981 972 966 949 958 994 9999 9999 9999 9999 9999 9999 982 968 979 972 981 990 9999 9999 9999 9999 9999 9999 22 981 964 964 975 967 992 9999 9999 9999 9999 9999 9999 993 967 984 976 1001 1000 9999 9999 9999 9999 9999 9999 23 1004 971 966 975 953 984 9999 9999 9999 9999 9999 9999 981 970 974 993 973 992 9999 9999 9999 9999 9999 9999 24 967 976 973 970 962 1001 9999 9999 9999 9999 9999 9999 976 975 979 993 987 1017 9999 9999 9999 9999 9999 9999 25 1000 983 959 966 940 978 9999 9999 9999 9999 9999 9999 968 987 1022 988 1026 1021 9999 9999 9999 9999 9999 9999 26 981 972 948 978 946 985 9999 9999 9999 9999 9999 9999 972 975 966 982 988 985 9999 9999 9999 9999 9999 9999 27 987 970 945 973 957 1010 9999 9999 9999 9999 9999 9999 979 968 975 988 979 929 9999 9999 9999 9999 9999 9999 28 989 973 957 979 958 998 9999 9999 9999 9999 9999 9999 987 969 956 988 983 956 9999 9999 9999 9999 9999 9999 29 993 966 943 988 957 977 9999 9999 9999 9999 9999 9999 982 975 956 989 981 926 9999 9999 9999 9999 9999 9999 30 979 946 977 964 996 9999 9999 9999 9999 9999 9999 982 967 971 997 912 9999 9999 9999 9999 9999 9999 31 988 938 967 9999 9999 9999 9999 977 974 1000 9999 9999 9999 9999 Mean 983 977 969 970 965 984 980 980 978 980 992 1001 980 974 979 979 987 1003 1001 1003 996 987 993 998