1. In May, 1903, I communicated to the Society a discussion of the results obtained from the Kew magnetographs during the eleven years 1890 to 1900, on the five quiet days a month selected by the Astronomer Royal. That paper will for shortness be referred to as (A). When dealing with data from a single station, even when representing many years’ observations, one is confronted by the possibility that the results may be appreciably modified by defects peculiar to the apparatus or to the methods of observation employed, or that they may be largely dependent on local conditions, and so of very limited applicability. For these reasons alone, it was desirable to discuss on parallel lines data from a second English observatory. Another reason for such an investigation was the disturbed magnetic conditions introduced at Kew in 1901 by electric trams. In consequence of their action, there is unlikely to be any adequate opportunity for comparing simultaneous undisturbed data from Kew and the new magnetic observatory now under construction in Eskdalemuir. Thus the most promising way of securing continuity is a minute comparison of Kew with some observatory now existent which is likely to continue free from tram disturbances for some time. Both sets of considerations pointed to a discussion of the results obtained at Falmouth Observatory. Magnetographs have been in constant operation at Falmouth since 1891. They have been under the direct supervision of Mr. Kitto, the Superintendent of the Observatory, who has acted throughout as magnetic observer. The behaviour of the vertical-force magnetograph has been indifferent, and the curves from it have not been measured; but the declination and horizontal-force magnetographs have worked satisfactorily, and the data obtained from them on the Astronomer Royal’s quiet days have appeared in the ‘Annual Reports of the Royal Cornwall Polytechnic Society,’ and also in the Royal Society’s ‘Proceedings,’ or the ‘Reports of the National Physical Laboratory.’
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