. English: Fleuron from book: A treatise on magnetism, with a description and explanation of a meridional and azimuth compass, for ascertaining the quantity of variation, without any calculation whatever, at any time of the day. Also improvements upon compasses in general. With Tables of Variation, for all Latitudes and Longitudes. By Ralph Walker, of Jamaica. 234 A treatise on magnetism Fleuron T013197-8

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