A Petersburg standard is 120/12 ft. 11 in. x 1 1/2in. = 165 ft. cube. To: i certain the number of feet run of any sized scantling required to make a standard, multiply 1,4410 by 16.5, and divide the product by the sectional area in square inches of the required scantling, the quotient being the number of feet. Taking 9in. x 2 in. as example: (9x2= 18). Then 1,440 16.5 x 18 = 1,320. The following table includes the most general sizes; others can be worked out as above: -

Size.

Foot Run.

4x2

2,970

4x3

1,980

5x2

2,376

51 x 2

2,160

6.V x 2

1,827 9/13

7 x 2 1/2

1,357 5/7

8x2

1,485

9x2

1,320

9x4

660

10 x 3

792

11 x 2 1/2

861

Size.

Foot Hun.

4 x 2 1/2

2,376

P. x 2

2,610

5 x 2 1/2.

1,960 1/5

6x2

1,980

7x2

1,697 1/7

7 x 3.

1,131 1/2

8 x3

990

9 x 3

880

10 x 2

1,188

11x2

1,080

11 x 3

720