Drawing, 'Hygrometer', by Charles Kite Line drawing, figure 1 illustrating Kite's paper 'A Register of the Barometer, Thermometer, Hygrometer...& appearance of the Sky, at Gravesend in Kent. For the years 1787 & 1788'. The accompanying text [p.9] states that: 'The Hygrometer - is composed of a piece of common whip cord seven feet long (See Fig.1a) one end of which is fixed; the other runs over a brass pulley (b) which moves on steel points, & directs a lever (d) which moves on a scale (cc) of 20 inches or 200 degrees...this instrument is kept in an open passage where it is continually exposed to a current of fresh air'. [1 January 1789]