'T Derde deel van 't Licht der zee-vaert, inhoudende de beschryvinghe der zeecusten van de Middelandtsche...

adhere that with good firm paper, draw on one edge a straight line, as in this figure the line A B C. Set a stiff compass paſſer drafting compass with one leg in point A, and describe with the other a portion of a circle as wide as the width of the board can hold, as B D E F. Keep the compass set at the same opening, and set one leg in B, and the other in the drawn circle, as wide as it can reach, as in E. Divide the arc B E into two equal parts at D, and carry the width B D or D E from E further along the circle until F, then draw a line from F to A. The angle F A B is then a right angle, and the arc B D E F a correct quadrant or quarter-circle. The parts E D, D E,

A geometric diagram shows a quadrant construction within a rectangle marked A, B, C, G, H, I, K, L. An arc is divided into 90 degrees starting at A, with radial lines and parallel horizontal lines intersecting the scale.

E F divide each again into three parts, and each of those in two, and those small parts then again each into five, so then that quadrant or quarter-circle will be divided into 90 degrees. One may also divide those degrees into smaller parts, such as halves, thirds, or fourths, as one wishes. The quadrant being thus divided, lay a straightedge liniael ruler with one end on point A, and with the other on each point of the division, and draw lines from point A through all those other points, as long as they can stand on the board, as can be seen in the figure above. That being done, the tool is ready. To then mark the staff, first take with a compass the exact width that is between E G, the front edge of the