58 ELEMENTARY WOODWORKING 
by human hands until it comes out as lumber of various 
sizes ready to be loaded on boats or cars. 
Logs are sawed into timber, planks, or boards, and 
these forms are called lumber. 
Timber refers to all of the largest sizes, such as beams 
and joists. Planks are wide strips over one inch thick, 
Fic. 71. A Large Band Saw 
and boards are one inch or less in thickness, varying in 
width and length. Lumber may be planed at a planing 
mill, and is then known as dressed lumber. It may be 
dressed on one, two, or all sides. Dressed stock which 
is free from knots, shakes, and sapwood is called clear. 
