Brickwork is estimated at the rate of a number of bricks in thickness, estimating a brick at 4 inches thick. The dimensions of a building are usually taken by measuring half round on the outside, and half round on the inside; the sum of these two gives the compass of the wall,-to be multiplied by the height, for the content of the materials. Chimneys are by some measured as if they were solid, deducting only the. vacuity from the hearth to the mantel, on account of the trouble of them. And by Others they are girt or measured round for their breadth, and the height of the story is their height, taking the depth of the jambs for their thickness. And in this case, no deduction is made for the vacuity from the floor to the mantel-tree, because of the gathering of the breast and wings, to make room for the hearth in the next story. To measure the chimney shafts, which appear above the building, gird them about with a line for the breadth, to multiply by their height. And account their thickness half a brick more than it really is, in consideration of the plastering and scaffolding. All windows, doors, etc, are to be deducted out of the contents of the walls in which they are placed. But this deduction is made only with regard to materials; for the whole measure is taken for workmanship, and that all outside measure too, namely, measuring quite round the outside of the building, being in consideration of the trouble of the returns or angles. There are also some other allowances, such as double measure for feathered gable ends, etc.

Example.-The end wall of a house is 28 feet long, and 37 feel high to the eaves: 15 feet high is four bricks or 1G inches thick, other 12 feet is three bricks or 12 inches thick, and the remaining 10 feet is two bricks or 8 inches thick; above which is a triangular gable 12 feet high and one brick or 4 inches in thickness. What number of bricks are there in the said wall? Ans. 25,620.

thickness.

98

X

15

=

420

X

4

=

1680

:contents of 1st story.

28

X

12

330

X

3

=

1008

"

"

2d

"

28

X

10

=

280

X

•J

=

560

"

"

3d

II

122

=

6

X

28

=

168

X

1

=

168

"

ii

gab

".

3416

square feet area of whole wall.

7

bricks to square foot.

23,912

By the table

1,708

3000

suprfi.

".

=

22,500

bricks.

400

"

"

3,000

"

Answer,-

25,,620 bricks.

10

"

"

75

"

6

II

"

45

"

3416

"

"

=

25,020

bricks

A Table by which to ascertain the. number of Bricks necessary to construct any Piece of Building, from a four-inch Wall to twenty-four inches in Thickness.

The utility of the Table (on next page) can be seen by the following Example. Required the number of bricks to build a wall of 12 inches thickness, and containing an area of 6,137 square feet.

Square feet

1000

22,500 bricks-See table.

X 6

6

NOTE. - 7 bricks, equal one superficial foot.

6000

=

135 000

400

-

9,000

30

=

075

7

=

158

6,437

=

144,833 bricks.

Superficial feel of Wall.

Number of Bricks to Thickness of

4-inch

8inch.

12-inch.

16-inch.

20-iuch.

| 24-inch.

1

8

15

23

30

38

45

2

15

30

45

60

75

00

3

23

45

68

90

113

135

4

30

60

90

120

150

180

5

38

75

113

150

188

225

6

45

90

135

180

225

270

7

53

105

158

210

263

315

8

60

120

180

210

300

360

9

68

135

203

270

338

405

10

75

150

225

300

375

450

20

150

300

450

600

750

900

30

225

450

675

900

1125

1350

40

300

600

900

1200

1500

1800

50

375

750

1125

1500

1875

2250

60

450

900

1350

1800

2250

2700

70

525

1050

1575

2100

2625

3150

80

600

1200

1800

2400

3000

3600

90

675

1350

2025

2700

3375

4050

100

750

1500

2250

3000

3750

4500

200

1500

3000

4500

6000

7500

9000

300

2250

4500

6750

9000

11250

13500

400

3000

6000

9000

12000

15000

18000

500

3750

7500

11250

15000

18750

22500

600

4500

9000

13500

18000

22500

27000

700

5250

10500

15750

21000

26250

31500

800

6000

12000

18000

24000

30000

36000

900

6750

13500

20250

27000

33750

40500

1000

7500

15000

22500

30000

37500

45000