EXAMPLE 2. Find the number of board feet in a scantling 2 inches by 4 inches, 18 feet long.

2 x 4
12

× 18 = 12, the number of board feet in the piece.

ORAL DRILL

1. How many board feet are there in a board 1 foot wide, 1 inch thick, and 12 feet long? 14 feet long? 8 feet long?

2. How many board feet are there in a board 6 inches wide, 1 inch thick, and 12 feet long? 16 feet long? 18 feet long?

3. How many board feet are there in a piece 16 feet long, 1 foot wide, and 4 inches thick? 6 inches thick? 8 inches thick?

Find the number of board feet in each of the following pieces, 1 inch thick, of length and width as follows:

Find the number of board feet in the following:
1. 8 planks 2 in. thick, 10 ft. long, 12 in. wide.
2. 12 planks 3 in. thick, 14 ft. long, 10 in. wide.
3. 16 planks 2 in. thick, 16 ft. long, 10 in. wide.
4. 16 planks 13 in. thick, 10 ft. long, 9 in. wide.

5. 2 sticks of timber 18 ft. long, 1 ft. wide, 8 in. thick. 6. 5 sticks of timber 16 ft. long, 10 in. wide, 9 in. thick.

7. 25 joists 3" by 4" and 16 ft. long.

8. 30 joists 2" by 4" and 14 ft. long. 9. 50 joists 4" by 8" and 16 ft. long. 10. 8 beams 12" by 12" and 12 ft. long.

Lumber less than 1 inch in thickness is figured as if it were 1 inch thick. Material over 1 inch thick is figured according to its actual thickness in inches and fractions of an inch.

Lumber is usually priced at so much per thousand (M) board feet. In practice the cost is computed at so much per board foot. Thus, lumber at $20 per thousand feet (M) is $.02 per board foot.

ORAL DRILL

Find the cost in each of the following: 1. 2000 ft. of Oregon pine at $22 per M. 2. 5000 ft. of pine flooring at $24 per M.

3. 10,000 ft. of rough redwood at $21 per M.

4. 20,000 ft. of spruce at $27 per M.

5. 6000 ft. of oak at $50 per M.

Exercise

Find the cost in each of the following:

1. 30 boards 1 in. thick, 8 in. wide, and 12 ft. long, at $22 per M.

2. 80 boards 1 in. thick, 8 in. wide, and 14 ft. long, at $25 per M.

3. 50 boards in. thick, 10 in. wide, and 16 ft. long, at $24 per M.

4. 100 planks 2 in. thick, 10 in. wide, and 18 ft. long, at $26 per M.

5. 200 boards in. thick, 6 in. wide, and 16 ft. long, at $30 per M.

6. 8 pieces 2" by 6", 12 ft. long, at $24 per M.

7. 24 pieces 2" by 8", 16 ft. long, at $22.50 per M.

8. 6 pieces 8" by 10", 18 ft. long, at $27 per M.

9. 3 pieces 40 ft. long, and 10" by 12", at $40 per M.

10. 30 pieces 16 ft. long, and 2" by 3", at $22 per M.

The Metric System

The Metric System is a system of weights and measures which originated in France. It is a decimal system of

great simplicity and has been adopted in nearly all civilized countries except the United States and the British Empire. It is almost universally used by scientists.

The primary units are the meter, liter, and gram. All other units are named from the primary units by using Latin and Greek prefixes. The Latin prefixes denote parts of the primary unit; the Greek prefixes denote multiples of the primary unit.

Deca means 10; thus, decameter means 10 meters.
Hecto means 100; thus, hectometer means 100 meters.
Kilo means 1000; thus, kilometer means 1000 meters.
Myria means 10,000; thus, myriameter means 10,000 meters.

Length

In the metric system the standard unit of length is the meter. It is about 39.37 inches. From the meter all the

other units in the system are derived.

A decimeter, or one tenth of a meter, is about 4 inches. A centimeter, or one one-hundredth of a meter, is about of an inch.

A millimeter, or one one-thousandth of a meter, is about 2 of an inch.