XXII. On the lunar-diurnal magnetic variation at Toronto

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Abstract
In fulfilment of an intention expressed to the Royal Society in November 1853, I have now the honour to submit to the Society the results of an investigation into the Moon’s diurnal influence on the horizontal and vertical components of the magnetic force at Toronto, and the consequent deduction of the Lunar-diurnal Variations of the Inclination and of the Total Force at that Station. The processes to which the observations of the Bifilar and of the Vertical force Magnetometers, as received from Toronto, were subjected after their arrival at Wool­wich, with a view to this and to other investigations, have been already partially described in a communication presented to the Society in a former part of the present Session. The processes there described had reference particularly to the reduction of the observations to a uniform temperature of the magnets employed to measure the variations of the respective components of the force,—to the elimination of the larger disturbances,—to the formation of normal values (omitting the disturbances) for each of the components at every hour of mean solar time for periods usually of a month’s duration,—and to the deduction of the solar-diurnal variation in different years and different months, after the larger disturbances had been eliminated.

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