A note on the magnetic declination or variation of the compass chart of the Southwest Pacific for epoch 1954.0

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Cullington, A.L 1954 A note on the magnetic declination or variation of the compass chart of the Southwest Pacific for epoch 1954.0. : . Report / Geophysics Division 12 4 p

Abstract: It is an annual requirement by the Lands and Survey Department, Wellington, for this Branch to prepare a chart showing the magnetic declination or variation of the compass over an extensive area of the south-west Pacific. This note describes the chart prepared showing the magnetic declination as at 1st January 1954. It deals with (1) the magnetic data available, (2) the determination of the secular variation, and (3) the reduction to the selected epoch, namely 1st January 1954. In effect the chart shows the predicted values for that date. The Lands and Survey Department makes use of this chart as a basic document for the revision of the magnetic data published by the Air Department in . (auth)