Slide-rule
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2 works
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- Online
The line of proportion or numbers, commonly called Gunter's line made easie : by the which may be measured all manner of superficies and solids as boards, glass, pavement, timber, stone, &c. : also, how to perform the same by a line of equal parts, drawn from the centre of a two-foot rule : whereunto is added, The use of the line of proportion improved : whereby all manner of superficies and solids may both exactly and speedily be measured, without the help of pen or compasses, by inspection, looking only upon the ruler / by William Leybourn.
Leybourn, William, 1626-1716Date: 1684- Books
- Online
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.
Leybourn, William, 1626-1716Date: 1677