MATERIALS.

concretes (English). Fire-brick beam, Portl'd cem't

8.1

" sand, 3 parts; lime, 1 part

.7

CEMENTS (English).

Blue clay and chalk

5.4

Portland.........................

37.5

102

Shenny......................

6.

MATERIALS.

bricks (English).

Best stock.............................

11.8

Fire-brick.................................

14.

New brick........................

10.7

Old brick..........................

9.1

Stock-brick, well burned..........

5.8

" inferior, burned..

2.5