Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.

Ʋpon the Chart.

UPON your Chart assign H for your Place from whence you came, in the Latitude of 52 degr. and Longitude 35 degr. Upon this Point H protract the Angle of the Rhumb 33 d. 45 m. N. E. by N. and draw the Rhumb-Line H K. Then the Latitude of the Place where you are being found by ob∣servation (or being otherwise given) to be 56 degr. draw a Line quite cross your Chart at the 56^th degree of Latitude, as the Line 56. 56 in the Chart crossing the Rhumb-Line in the Point K. So K L, being measured at the bottome of your Chart, will be found to contain 2 degr. 45 min. which added to 35 degr. the Longitude you came from, makes 37 degr. 40 min. And that is the Longitude in which you are. In like manner measure H K upon the Side of your Chart, and you shall find it to contain 96 2/10 Leagues. And so much hath the Ship run upon that Point N. E. by N.