Classification and methods of sawing timber

Classification of timber:

Wood suitable for building or other engineering works is called timber

• When it forms a part of a living tree, it is called standing timber

• When the tree has been felled, it is called rough timber

• When it has been sawn to various market forms such as beams, battens, planks etc, it is called converted timber

Classification of Trees

Trees can be divied into the following groups

1. Endogenous
2. Exogenous

These are explained as below:

1. ENDOGENOUS:
   

Trees which grows inward in a longitudinal fibrous mass, such as canes, bamboo, palms etc

2. EXOGENOUS:
   

Trees which grows outward from the centre in approximate concentric rings across the longitudinal section of the stem. Each ring representing a layer deposited every year. Extensively used in engineering works. Exogenous trees are further divided into

B-1) Conifer:

• Evergreen tree yielding softwood
• Trees with pointed leaves
• Pine, Chirr
  

B-2) Deciduous:

• Trees with broad leaves yielding hardwood
• Shed their leaves in winter (Sal, Sheesham etc)