TIMBEE NOTES 225 



TECHNICAL PROPERTIES OP TIMBER. 



Durability (according to Gayer). 



Most durable : Pedunculate Oak, resinous Larch, re- 

 sinous Scots Pine, Sessile Oak, Black Pines, Acacia, 

 Sweet Chestnut, Elm. 



Durable : Ash, Larch grown at low elevations, Scots 

 Pine of quick growth with small summer zones of wood 

 and less resinous, Spruce from lofty elevations, silver 

 Fir. 



Least durable : Conifers of very rapid growth and poor 

 in resin, Beech, Hornbeam, Maple and Sycamore, Alder, 

 Birch, Aspen, Lime, Weymouth Pine, Poplar, Willow. 



Hardness (Nordlinger). 



Very hard : Boxwood, Hawthorn, Blackthorn. 



Hard : Acacia, Maple, Sycamore, Hornbeam, Peduncu- 

 late Oak. 



Moderately hard : Ash, Plane, Elm, Beech, Sessile 

 Oak. 



Soft : Spruce, Silver Fir, Alder, Horse Chestnut, Birch, 

 Larch, Austrian Pine, Scots Pine, Sallow. 



Very soft : Weymouth Pine, all Poplars, most Willows, 

 Lime. 



Utility as firewood (Gayer). 



Having greatest heating power : Hornbeam, Beech, Birch, 

 Acacia, resinous Scots Pine, Austrian Pine. 



Having considerable heating power : Maple, Sycamore, 

 Ash, English Elm, resinous Larch, ordinary Scots Pine, 

 Oak, 



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