261 
; 
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The Strength and Elasticity of Ironbark Timber 
as applied to Works of Construction. 
By W. H. Warren, A.M.LC.E., Professor of Engineering, 
University of Sydney. 
[Read before the Royal Society of N.S.W., Ist December, 1886.] 
tory of the University of Sydney by means of the testing 
following :— 
1. Experiments on the transverse strength and stiffness of 
beams of Colonial timber 2 in. wide by 2 in. deep when tested on 
supports 4 ft. apart, made at the Sydney Mint, by Col. Ward and 
Mr. Trickett, in 1861. 
2. An experiment made by Mr. John Whitton, Engineer-in- 
Chief for Railways, on a beam of ironbark 12 in. by 12 in., when 
tested on supports 26 ft. apart. 
3 An experiment made on a similar piece of ironbark 12} in. 
by 12} in., when tested on supports 28 ft. 6 in. apart, by the 
Railway Bridges Inquiry Commission. 
. Sorhe experiments made by Mr. Thomas Laslett, Timber 
Inspector to the Admiralty, in 1875, and recorded by D. K. Clark 
in his “ Rules, Tables, and Data for Mechanical Engineers.” 
The experiments made at the Sydney Mint, in 1861, furnish 
exact data on the strength of simple beams of small scantling, and 
when these are compared with the experiments made b: rn 
transverse strength of ironbark beams of small scantling give 
the Mint experiments; but his experiments on the tensile 
_yesistance of ironbark appear to have been inaccurate. This 
i erred 
matter will be again ref to. 
