BUILT OF FACE-BRICKS (M. W. SANDS, CAMBRIDGE, MASS.). AGE, 18 TO 24 MONTHS.

Nominal Dimensions.

Composition of mortar.

Weight per cubic foot.

Sectional area.

First crack.

Ultimate strength.

Height.

Cross-section.

Total.

Per sq. in.

Per sq. ft.

% of single brick.

Ft.

In.

In.

In.

lbs.

lbs.

lbs.

lbs.

Tons.

1

4

8

8

1 lime, 3 sand,

137.4

57.00

85,000

143,600

2,520

181.4

18.1

6

8

8

8

" "

133.5

57.76

50,000

108,400

1,877

135.1

13.5

1

4

8

8

1 Portland cement, 2 sand,

136.3

57.76

200,000

218,100

3,776

271.8

27.1

6

8

8

8

" "

133.5

57.76

85,000

129,900

2,249

161.9

16.2

2

0

12

12

1 lime, 3 sand,

132.25

140,000

257,100

1,940

139.7

13.9

a 2

0

12

12

" "

113.76

90,000

226,100

1,990

143.3

14.3

10

0

12

12

" "

131.7

132.25

70,000

199,800

1,511

108.8

10.9

b10

0

12

12

" "

125.0

115.44

100,000

208,600

1,807

130.1

13.0

2

0

12

12

1 Portland cement, 2 sand,

132.25

200,000

486,000

3,670

264.2

26.4

10

0

12

12

" "

132.2

132.25

200,000

298,000

2,253

162.2

16.2

BUILT OF COMMON BRICKS (M. W. SANDS).

1

4

8

8

1 lime, 3 sand,

135.6

60.80

66,000

148,800

2,440

175.6

13.3

6

8

8

8

" "

133.6

62.40

96,100

1,540

110.8

8.4

2

0

12

12

" "

138.06

75,000

296,400

2,150

154.8

11.7

9

9

12

12

" "

131.5

138.06

70,000

154,300

1,118

80.5

6.1

c 10

0

12

12

" "

136.0

115.50

70,000

183,300

1,587

114.3

8.6

10

0

12

12

1 Portland cement, 2 sand,

131.0

138.06

276,600

2,003

144.2

10.9

2

8

16

16

" " "

256.00

460,000

696,000

2,720

195.8

14.8

10

0

16

16

" " "

256.00

340,000

483,100

1,887

135.8

10.3

a Has hollow core 4.25x4.25 inches. b Has hollow core 4.1x4.1 inches. c Has hollow core 4.75x4.75 inches.

BUILT OF COMMON BRICKS (BAY STATE).

d 6

0

12

12

1 lime, 3 sand,

118.2

144.00

80,000

191,600

1,331

95.8

11.7

e 6

0

12

12

" "

118.1

156.25

110,000

189,200

1,211

87.2

10.6

6

0

12

12

1 Rosendale cement, 2 lime mortar,

120.6

144.00

160,000

237,000

1,646

118.5

14.4

6

0

12

12

" " 2 sand,

123.0

144.00

260,000

284,000

1,972

142.0

17.3

6

0

12

12

1 Portland cement, 2 lime mortar,

120.3

144.00

150,000

203,200

1,411

101.6

12.4

6

0

12

12

" " 2 sand,

119.7

144.00

220,000

258,000

1,792

129.0

15.7

6

0

12

12

Neat Portland cement,

126.6

144.00

280,000

342,000

2,375

171.0

20.8

d Joints broken every 6 courses. e Bricks laid on edge.