Brown, John (Philomath). Supplement to The line of proportion

The line of proportion, commonly called Gunter's line, made easie : a second part, with the addition of other lines, which may conveniently be put upon a two-foot rule and their uses exemplified / by Wil. Leybourn ... ; to which is added a supplement, containing the description and some uses, of a convenient two-foot joynt-rule ... by John Brown.