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THE NEW  STUDENT'S   REFERENCE  WORK

2185

PRACTICAL APPLICATION OF SURFACE MEASURE.

BOARD MEASURE.

A board foot is the unit of measure for boards, planks, timbers, and joists.

A board foot is 1 foot long, 1 foot wide, and 1 inch thick. Lumber less than 1 inch thick is considered 1 inch thick in measuring.

To find the number of feet of lumber or any timber, find the area of one face in square feet and multiply by the thickness in inches.

EXERCISE 26. Find the board feet in the following:

1.   A board 21 ft. long, 8 in. wide, % in. thick.

2.   A board 18 ft. long, 12 in. wide, 1 in, thick.

3.   8 joists, each 3 in. by 4 in. and 15 ft. long.

4.   5 2-in. planks, each 12 ft. long, 10 in. wide.

5.   8 boards each 15 ft. long, 9 in. wide, I1/? in- thick.

CARPETING.

In determining the number of yards of carpet that must be bought to carpet a floor, divide the width of the room by the width of the carpet, to find the number of breadths.

A fractional part of a breadth should be regarded as a full breadth. Multiply the length of each breadth by the number of breadths.

What is the cost of carpeting a room 24 ft. long, 15 ft. wide, with carpet % yd. wide, at $1.15 per yard, the breadths to be laid lengthwise!

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15 ft. -f- 2J ft. ~ 6| = 7 breadths 24 ft. X 7 = 168 ft. = 56 yds. $1.15 X 56 = $64.40.

EXERCISE 27.

1.  Find the cost of carpeting a floor 24 ft. long and 18 ft. wide, with carpet % yard wide, at 95c per yard, breadths to be laid lengthwise.