Diagrams, 'Mean diurnal variation of declination, from hourly observations at Fort Rae [Canada]' by H P Dawson Dawson writes: 'The accompanying diagrams represent the mean diurnal variation of declination for each month from September, 1882, to August, 1883, at the Circumpolar station at Fort Rae, British North America. These curves are plotted from the hourly means for each month, and include the effect of disturbances which have greatly influenced them during the winter months, especially in November.' Subject: Magnetism Prints of these graphs were published in volume 36 of the Proceedings of the Royal Society alongside the paper 'On the mean diurnal variation of magnetic declination, from hourly observations at Fort Rae'. 20 February 1884