Abstract
THE use of observatory data as a basis for the correction of diurnal variation in magnetic surveys is common both for secular repeat stations spread over a wide area, and in ground and marine magnetic surveys where limitations of personnel and equipment prohibit the maintenance of a local base. Geographical interpolation of the variations is usually based on local time and latitude, the errors involved in this procedure being assumed to be small. In 1918, Walker1 stated that such interpolation was incorrect, although he was prevented by the First World War from carrying out investigations to provide a more rigorous alternative. So far as I am aware, the situation today is little changed, at least in the British Isles.
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