WOODS. 
Sixty-three Specimens, illustrating the results of a 
Series of experiments on the strength of New Zealand 
and other Colonial Woods, conducted at Dunedin, for 
the Commissioners of the New Zealand Exhibition, 
by James Melville Balfour, C.E. (See Jurors’ Report, 
page 459.) 
REFERENCE TO LETTERS ON SPECIMENS, 
A.—Weight of a cubic foot. 
B.—Greatest deflection in inches, elasticity remaining 
uninjured. 
C.— Greatest weight carried with unimpaired elasticity, 
D.—Deflection in inches at instant of fracture. 
H.—Length of a beam 12 inches deep and 6 inches 
broad, supported at both ends, which will just 
break with its own weight. 
F.—Breaking weight at centre of a beam 20 feet clear 
span (supported at ends), reduced to a uniform 
weight of 20 Ibs. per lineal foot, and having the 
proportion of depth equal twice breadth. 
The following abstract shows the comparative value of 
the different Woods in this Collection. 
1*Black Maire. Hawke's Bay. 314:2-+ 
Titoki. Wellington. 248°0. 
Black Mapau. Dunedin. 243-0, 
Manuka. Wellington. 263-5. 
Manuka. Dunedin. 240-0, 
Kowhai. Wellington. 271:7. 
Kowhai. Dunedin. 189-0, 
NIOAXUPF why 
“These numbers correspond with those in Appendix C, 
Jurors’ Report, pages 474 to 491. 
+ Relative strength, in Ibs. 
