UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 556 
Contribution from the Forest Service 
HENRY S. GRAVES, Forester . 
Washington, D, C 
PROFESSIONAL PAPER 
September 15, 1917 
MECHANICAL PROPERTIES OF WOODS 
GROWN IN THE UNITED STATES 
By 
J. A. NEWLIN,' in Charge of Timber Tests 
and THOMAS E. C. WILSON, Engineer in 
Forest Products 
CONTENTS 
Parpcss of the Study . . . . , . . . 
Scope and Method of Experiments . . . 
Precautions to be Observed In the Use of 
ifr Data ....... 
Data on Green Timber ■'.-'. 
Data on Air-dry Timber . - . . . . . 
Exp!anaiion of Tables 1 and 2 . , c , 
Explanation of Tab's 3 . «, , . . . . 
J age 
1 
Page 
Glossary • . 20 
Formuhs Used in Computing . . . . . 24 
TabJel . 26 
Table 2 37 
List of Publications and Papers Dealing 
with the Mechanical Properties of 
Timber 46 
$4 E^Wmli 
■PS-'-'- 
WASHINGTON 
GOVERNMENT PRINTING OFFIGB 
1917 % 
