422 Mr. Bevan's Experiments on the Modulus of Torsion. 



or nearly |ths of an inch. And as the deflection will be di- 

 rectly as the foi-ce, a weight or force of 300 lbs. would produce 

 a deflection of y^th of an inch. 



Table of the Modulus of Torsion. 



„ . r^TT J Modulus of Torsion. 



Species ot \V oca. ^^^ 



Acacia (not quite dry) sp. grav. -795 28293 



Alder (crossed-grained) sp. grav. 'oS 16221 



Apple sp. grav. -726 20397 



Ash (of my own planting) 20300 



Ash (mountain) sp. grav. •4'49 13933 



Beech 21243 



Birch 17250 



Box (old, and very dry) sp. grav. '99 30000 



Brazil wood (old, and very dry) sp. grav. 1-05 37S00 



Cane (influenced by the hard surface) . . . 21500 



Cedar (scented) 12500 



Cherry sp. grav. -71 22800 



Chesnut (sweet) 18360 



Chesnut (horse) sp.grav. '615 22205 



Crab sp.grav. -763 22738 



Damson 23500 



Deal (Christiana) sp.grav. -38 11220 



Elder sp.grav. '755 22285 



Elm 13500 



Fir (Scotch) 13700 



Hazel (not quite dry) sp. grav. '83 26325 



Holly 20543 



Hornbeam (not quite dry) . . . . sp.grav. '86 26411 



Laburnum (green, or fresh cut) 18000 



Lance-wood sp.grav. TOl 25245 



Larch sp. grav. '58 18967 



Lime or Linden sp. grav. -675 18309 



Maple (partly cross-grained) . . sp. grav. '735 23947 



Oak (English) 20000 



Oak (Hamburgh) sp.grav. -693 12000 



Oak (Dantzic) sp. grav. -586 16500 



Oak (from Bog) sp. grav. -67 14500 



Ozier 18700 



Pear sp. grav. '72 18115 



Pine (St. Petersbupgh, fresh) 10500 



Pine (St. Petersburgh, four or five years old) 13000 



Pine (Memel) 15000 



Pine (American) 14750 



Plane 



