c. Tabular Method. The standard essex board measure table
(Figure 122) is a quick aid in computing BF. It is located on the
back of the blade of the framing square. In using the board measure
table, make all computations on the basis of 1inch thickness. The
inch markings along the outer edge of the blade represent the width
of a board 1 inch thick. The third dimension (length) is provided in
the vertical column of figures under the 12inch mark.
Essex board measure table
SAMPLE PROBLEM: To compute the number of BF in a piece of lumber that
is 8 inches wide, 14 feet long, and 4 inches thick
Find the number 14 in the vertical column under the 12inch mark.
2. Follow the guideline under number 14 laterally across the blade
until it reaches the number on that line that is directly under the
inch mark matching the width of the lumber.