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Lignum vitae is hard and durable, and is also the densest wood traded (average dried density: ~79 lb/ft 3 or ~1,260 kg/m 3); [4] it will easily sink in water. On the Janka scale of hardness, which measures hardness of woods, lignum vitae ranks highest of the trade woods, with a Janka hardness of 4,390 lbf (compared with Olneya at 3,260 lbf, [5] African blackwood at 2,940 lbf, hickory at 1,820 ...
When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ASTM D143) is at 12% moisture content and clear of knots. [3] The hardness of wood varies with the direction of the wood grain. Testing on the surface of a plank, perpendicular to the ...
This is a list of woods, most commonly used in the timber and lumber trade. Soft woods (coniferous) Araucaria. Hoop pine (Araucaria cunninghamii)
Xanthostemon verdugonianus is known to be the hardest Philippine hardwood species. Cutting a 70-cm thick tree with axes normally requires three hours, but cutting a Mangkono tree with the same diameter usually takes two to four days.
The invention of the use of Guaiacum for syphilis. The genus is famous as the supplier of lignum vitae, which is the wood of several species in the genus. [citation needed] It is the fourth-hardest variety of wood as measured by the Janka hardness test, requiring a force of 4,500 lb f (20,000 N) to embed a steel ball 0.444 in (1.13 cm) in diameter half that distance into the wood.
The coniferous Coast redwood (Sequoia sempervirens) is the tallest tree species on earth.. The world's superlative trees can be ranked by any factor. Records have been kept for trees with superlative height, trunk diameter (girth), canopy coverage, airspace volume, wood volume, estimated mass, and age.
Experts plan to remove the wood in order to eventually complete a full museum reconstruction. Archaeologists just recently uncovered a fascinating find in southern Germany. Located in the Danube ...
Deodar is the most important timber tree providing soft wood. It can be easily worked and it is moderately strong. It possesses distinct annual rings. It is used for making cheap furniture, railway carriages, railway sleepers, packing boxes, and structural work. Gambar Gmelina arborea: Pale yellow 580 kg/m 3: 980 lb/cu yd Central India, South India