• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Framing Square Tables
Essex Board

Builder 3&2 Volume 02 - Construction manual for building structures
Page Navigation
  43    44    45    46    47  48  49    50    51    52    53  
Figure  2-11.-Brace  table. brace table, located on the back of the tongue; and the Essex board measure table, located on the back of the blade. Before you can use the unit length rafter table, you must be familiar with the different types of rafters and with the methods of framing them. The use of the unit length rafter table is described later in this chapter. The  other  two  tables  are  discussed  below. Brace The brace table sets forth a series of equal runs and rises for every three-units interval from 24/24 to 60/60, together  with  the  brace  length,  or  length  of  the hypotenuse, for each given run and rise. The table can be used to determine, by inspection, the length of the hypotenuse  of  a  right  triangle  with  the  equal  shorter sides of any length given in the table. For example, in the segment of the brace table shown in figure 2-11, you can see that the length of the hypotenuse of a right triangle with two sides 24 units long is 33.94 units; with two sides 27 units long, 38.18 units; two sides 30 units long, 42.43 units; and so on. By applying simple arithmetic, you can use the brace table to determine the hypotenuse of a right triangle  with  equal  sides  of  practically  any  even-unit length. Suppose you want to know the length of the hypotenuse of a right triangle with two sides 8 inches long. The brace table shows that a right triangle with two sides 24 inches long has a hypotenuse of 33.94 inches. Since 8 amounts to 24/3, a right triangle with two shorter sides each 8 inches long must have a hypotenuse of 33.94  ÷3,  or  approximately  11.31  inches. Suppose  you  want  to  find  the  length  of  the hypotenuse of a right triangle with two sides 40 inches each. The sides of similar triangles are proportional, and any right triangle with two equal sides is similar to any other right triangle with two equal sides. The brace table shows that a right triangle with the two shorter sides 2-8







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.