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6. To keep a Register of all changes of Wind and Weather at all hours by Night and by Day, shewing the point the Wind blows from, whether strong or weak: The Rains, Hail, Snow, and the like; the precise times of their beginings and continuance; especially Hurricans and Spouts; but above all to take exact care to observe the Trade-Winds, about what degrees of Latitude and Longitude they first begin, where and when they cease or change or grow stronger or weaker, and how much, as near and exact as may be.
The strength of the winds is measured by an Instrument, such is represented by Figure 6; which being exposed to the Wind, so as the flat side may be right against it, the number of Degrees upon the Limb A B, to which the Wind blows-up, or raises, that flat side C D, shews the force or strength of the Wind, in proportion to the resistance of the flat side of the Instrument; and is to be recorded.
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