H.—34.

Tilting of the Ground. The east-west component clinograph was installed in September, 1930, in the Observatory cellar. The graph showing tilting of the ground at Kelburn has been constructed by plotting daily mean values from the clinograph records. The graph may be interpreted as representing the movements of the upper end of a rod fixed firmly in the ground in a vertical position so that it partakes of any movement of the ground in its vicinity. The records available so far are not sufficient to enable any definite conclusions to be drawn as to real earth-movements. It will be necessary to eliminate the effects due to meteorological conditions, and also to determine whether the movements indicated are local or widespread.

Tilting of Ground at Kelburn, Wellington: E.-W. Component.

General. Publications. The following Observatory publications have been issued during the year :— E.-20. —Earthquake Report for 1929, January to March. E.-2L—Earthquake Report for 1929, April to June, E.-22.—Earthquake Report for 1929, July to September. As in the past years, the Observatory is again indebted, to individuals and institutions for valuable gifts and publications. Some of these are presented in exchange for the Bulletins. Meteorological Records. The following are the meteological records for 1930 :— Barometer (height above sea-level, 415 ft.) — Maximum reading, 30-19 —May 10th and 11th. Minimum reading, 28-83—September 29th. Temperature (in transit-room) — Maximum reading, 65°-6 P.—February 9th. Minimum reading, 52°-9 F.—July 29th. . Temperature (in clock-room) — Maximum reading, 65°-0 F.—February 16th. Minimum reading, 55°-2 F. —July 28th. Staff. The staff for 1930 was as follows : Mr. R. C. Hayes, Professional Assistant, Mr. I. L. Thomsen, clerical cadet. Mr. P. W. Glover was engaged at the Observatory from July 31st to September 20th, and was concerned with the preparations for the Eclipse Expedition. Mr. A. G. C. Crust assisted during the year when the other officers were absent at University lectures, and also took a part in the overtime work at the Observatory. It will be seen that the activities of the Observatory have increased very much of late. C. E. Adams, Dominion Astronomer and Seismologist. Dominion Observatory, Kelburn, Wellington, N.Z., 14th May, 1931.

Approximate Cost of Paper.—Preparation, not given; printing (850 copies, including graphs), £78.

Authority: W. A. G. Skinner, Government Printer, Wellington.—l93l.

Price Is. 6'tZ.]

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