Name of Material.

Weight perCu. Ft.

Pounds.

Specific Gravity.

Bluestone ..........................................

160

2.56

Brick, pressed..................................

150

2.40

Brick, common

125

2.00

Chalk ................................................

156

2.50

Charcoal.............................................

15-30

.24-.48

Clay, compact

119

1.90

Coke, loose

23-32

.37-.51

Coal, hard, solid ...............................

93.5

1.50

Coal, hard, broken.............................

54

.865

Coal, soft, solid...................................

84

1.35

Coal, soft, broken................................

50

.80

Concrete, cement .............................

140

2.25

Cement, Portland .............................

80-100

1.44

Cement, Rosendale............................

56

.89

Earth, dry, shaken............................

82-92

1.36

Earth, rammed...................................

90-100

1.52

Earth, moist, shaken.........................

75-100

1.81

Glass, average....................................

186

2.98

Glass, common window ...................

157

2.52

Granite...............................................

170

2.72

Gravel (see sand) .............................

Limestones and marbles....................

168

2.70

Lime, quick.......................................

53

.85

Marble (see limestone)......................

Plaster of Paris...................................

141.6

2.27

Porphyry ..........................................

170.0

2.73

Quartz ...............................................

165

2.65

Sand...................................................

90-106

2.65

Sandstone .........................................

151

2.41

Shales................................................

162

2.60

Slate..................................................

175

2.80

Trap rock ..........................................

187

3.00

Masonry.

Common brickwork, cement mortar

130

2.10

Common brickwork, lime mortar.......

120

1.90

Granite or limestone rabble, dry......

138

2.21

Granite or limestone rabble.......

154

2.45

lite or limestone, well dressed

165

2.65

Mortar, hardened .............................

103

1.65

Pressed brickwork............................

140

2.25

Sandstone nibble ............................

145

2.32