Page:Philosophical Transactions - Volume 002.djvu/43



He 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. The