(From the Architects' and Builders' Pocket Book.)

BRICKWORK IN WALLS OR PIERS.

Tons per square foot.

Eastern

Western

Red brick in lime mortar............................

7

5

" hydraulic lime mortar.......................

6

" natural cement mortar, 1 to 3......................

10

8

Arch or pressed brick in lime mortar......................

8

6

" " " natural cement......................

12

9

" " " Portland cement..............................

15

12

Piers exceeding in height six times their least dimensions should be increased 4 inches in size for each additional 6 feet.

STONEWORK.

(Tons per square foot.)

Rubble walls, irregular stones................................

3

" coursed soft stone..............................

2

" " hard stone.......................

5

to

16

Dimension stone, squared in cement:

Sandstone and limestone.................

10

to

20

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

20

to

40

Dressed stone, with 3/8-inch dressed joints in cement:

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

60

Marble or limestone, best.................

40

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

30

Height of columns not to exceed eight times least diameter.

CONCRETE.

Portland cement, 1 to 8.....................

8

to

15

Rosendale cement, 1 to 6......................

5

to

10

Hydraulic lime, best, 1 to 6.............................

5

HOLLOW TILE.

(Safe load* per square inch of effective bearing parts.)

Hard fire-clay tiles....................

80

lbs.

" ordinary clay tiles..................

60

II

Porous terra cotta tiles........................

40

II

MORTARS.

(In -inch joints, 3 months old, tons per square foot.)

Portland cement, 1 to 4

40

Rosendale cement, 1 to 3

13

Lime mortar, best

8

to

10

Best Portland cement, 1 to 2, in -inch joints for bedding iron plates

70