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Then add up the firft Column, from the Sum of which fubftract the Sum of the Column of Brick and half Deductions; alfo from the Sum of the fecond Column, fubftract the Sum of the one Brick Deducti ons, (if there be any; then reduce the Remainder to the thickness of a Brick and half, and add that refult to the Remainder of the firft Column, which gives the Content of the Brick work in Feet, and the
Rods are found by dividing it by 272: As plainly appears in the Operation.
The Art of Surveying and Meafuring of Land.
Firft of the Chain.
Ecaufe Mr Gunter's Chain is most in use among Surveyors for meafuring of Lines, I fhall chiefly infift on that Meafure, it being the beft in ufe for Lands.
This Chain contains in Length 4 Pole or 66 Feet, and is divided into 100 Links, each Link is therefore inLength 7-Inches: If you would turn any Number of Chains into Feet, you muft multiply them by 66, as 100 Chains multiplied by 66, makes 6600 Feet; but if you have Links to your Chains to be turned into Feet and parts of Feet, you must fet down the Chains and Links, as if they were one whole Number, and after having multiplyed that Number by 66, cut from the product the two laft Figures to the Right Hand, which will be the Hundredth Parts of a Foot, and thofe on the Left hand the Feet required.
Example. Let it be required to know how many Feet there are in 15 Chains 25 Links. I let down thus the Multiplicand 15,25 The Number ct Feet in i Chain, 66 Multiplyer.
Product in Feet. 1006150 The Product is 1006 : This is so plain, it needs no other Example.
But now on the other hand, if one thoufand and fix Feet and an halt was given you to reduce into Chains and Links; you muft divide 1000.50 by 66, the Quotient will be 15, 25, viz. 15 Chains 25 Links.
In like manner, if it had been asked, how many Perches had been contained in 25 Chains 25 Links, you most divide 15, 25 by 25, the Links in cne Perch and the Quotient Answers the Question. 25.115,25(61. Answer in Perches.
Admit I would know how many Chains are contained in 500 Feet,
38 Anf7 Chains 57 Lin.