28:0

Now to cast up their Dimensions:

Dedu&tions. make 4 Columns, Br. I Br. | 1 'Br. { 1.B asinthe Margin, in

F. In. F. F. In. the first of which "384:0 494:0

13340

73:6

624 :0 96:0 put all the product 1499:4 96:0 | 171:6 of one Brick and half Thickness 3507:4 686:0 273:2 that are not De 273:2 ductions, if there

3234:2 be any of 3 Bricks

457,4 thick put it down

R. Q. F. twice, Esc. then 3693:6= 13

636 put down all er. cept deductions that are one Brick 3)1372(457 thick, if two, twice

**17 ard if only half, as in the Exam

3

272)3693.0) (13. ple.

973 157.

2:21

Then add up the firft Column, from the Sum of which fubftract the Sum of the Column of Brick and half Deductions; al. so from the Sum of the second Column, fubftract the Sum of the one Brick D:ductions, (if there be any :) then reduce the Red mainder to the thickness of a Brick and half, and add that result to the Remainder of the first Column, which gives the Con. tent 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 Mea

suring of Land.

First of the Chain. Beam

Ecause Mr Gunter's Chain is most in use

among Surveyors for measuring of Lines, I shall chiefly insist on that Measure, it being the best in use for Lands.

This Chain contains in Length 4 Pole or 66 Feet, and is divided into 100 Links, each Link is therefore in Length 72-Inches: If you would turn any Number of Chains into Feet, you must multiply them by 65, 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 set down the Chains and Links, as if they were one whole Nuinber, and after having multiplyed that Number by 66, cut from the product the two last Figures to the Right Hand, which will be the Hundredth Parts of a Foot, and those on the Left hand the Feet required.

F

Examples

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.

9150 9150

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.

150

Admit I would know how many Chains are contained in 500 Feet,

Operation. 66)500(7,

462

38 Anf7 Chains 57 Lin.

100

66)3800(57

330

500
462

38

Long Measure.

Inches

Feet.
I 2

Yards
26 3

Poles
19
7920 660 220 40 Furl.
163360 52801760320 8 Mile.

161

A T A BL E of Square Measure.

Inch
Inch 1

Links
Links 6 2.72 I

Feet
Feet 144
2,295

Yards
Yards 1 296
20,75 19

I

Pace
Pace 13600

57.38
25
2,778
I

Perch.
Perch 39264
625 272,25 30,25 10,89 I

Chain
Chain 627261 10000

484

I00000
Acre 16277540

143560

4840

1742,4 Mile 4014489600 64000000 278784003097600 1115136 102400 6400l6401

4356