APPENDIX. 



205 



In Table 73 the fractions are given in twelfths (small figures), 

 making adding easier. Thus the following 1-inch lumber would 



be added: 



Size. Contents. 

 10' x 7"= 510 

 12' xlO"=10 

 12' x 16"= 16 

 14' x 13"= 152 

 16' x 20"= 268 



Total=72f or 73| board feet. 



If it were 3-inch lumber the total would be multiplied by 3, or a 

 total of 221 board feet. 



TABLE 74. Compound Interest, or the Amount of 1 Dollar for 

 Different Periods at Different Rates. 



