SPECIFIC GRAVITY. 



33 



Moderately heavy Woods (sj). gr. 0"5o — 0'70). 



Elm, common maple, apple-tree, sweet-chestuut, sycamore, 

 birch, larch and horse-chestnut. 



Light Woods (0'55 and less). 



Black alder, sallow, Scotch pine, aspen, black pine, white 

 alder, white poplar, silver-fir, lime, spruce, Cembran and Wey- 

 mouth pines. 



6. Absolute Weiglit of IVood. 



The absolute weight of any piece of wood may be readily 

 calculated from its specific weight, by multiplying its volume in 

 cubic centimeters by the number representing its specific gravity, 

 the result being in grams. [Also multiplying the sp. gr. of 

 a wood by 62^ lbs. and by its volume in cubic feet will give the 

 weight of a piece of wood in lbs. — Tr.] A knowledge of the 

 actual weight of a piece of wood is most useful in the case of 

 wood dried in the forest, as this greatly influences its trans- 

 portability. 



The following figures are taken from weighments actually made 

 by Bohmerle and Vultejus, but it should be remembered that the 

 term forest-dried is very elastic. 



Oak, Beeeh, Tlornhcam, Ash, Maple and Elm. 



cwt. lbs. 

 Solid cubic foot of timber .... 

 Stacked 100 cubic feet of split firewood billets 

 Ditto, round billets .... 

 Ditto, rootwood 



Beach a)id Hornheani. 



Solid 100 cubic feet of split billets 

 Ditto, round billets 



VOL. V. 



46 83 

 45 70 



