The description and use of the carpenters-rule: together with the use of the line of numbers (inscribed thereon) in arithmetick and geometry. And the application thereof to the measuring of superficies and solids, gaging of vessels, military orders, interest and annuities: with tables of reduction, &c. : To which is added, the use of a (portable) geometrical sun-dial, with a nocturnal on the backside, for the exact and ready finding the hour of the day and night: and other mathematical conclusions. Also of a universal-dial for the use of seamen or others. With the use of a sliding or glasiers-rule and Mr. White's rule for solid measure. / Collected and fitted to the meanest capacity by J. Browne.

Example.

If 2 Yards of cloath cost 8 s. what cost 11 yards ½? the answer is 46 s. for if you set 2 on any one side, to 8 on the other, then look for 11½ on the first side where 2 was, and right against it on the second you shall find 46, the number required. Note that all your Fractions on the Line of Numbers are Decimal Fractions, and to work them, you must reduce your proper Fractions to them, which for ordinary Fractions you may do it by Inches and Foot-measure, but this

general Rule by the numbers will re∣duce any kind whatsoever, as thus: Suppose I would have the Decimal fraction of 9 Foot 7 Inches ¾, first note that 9 are Integers, for the rest, say thus, as 48 the number of Quar∣ters in (12 Inches or) one Foot, is to 1000; so is 31 the number of Quar∣ters in 7 Inches 3 Quarters, to 645 the Decimal Fraction required, for 9645 is equal to 9 Foot 7 Inches ¾, and so for any other whatsoever.