C—la
Plate I.
Mean monthly H.F. at Christchurch for combined years 1905-1910 and 1914-1919.
Jan. Feb. Mar. Apl. May Jun. Jly, Aug. Sept. Oct. Nov. Dec A.= Curve of annual cyclic change, 1914 and 1919. B, C.= Apparent constituent curves.
C—la
Plate I.
Mean monthly H.F. at Christchurch for combined years 1905-1910 and 1914-1919.
Jan. Feb. Mar. Apl. May Jun. Jly, Aug. Sept. Oct. Nov. Dec A.= Curve of annual cyclic change, 1914 and 1919. B, C.= Apparent constituent curves.
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