421 
of E. After this, successive additions were made of cwt. at the intervals and in the manner already 
mentioned until the beam broke; the breaking weight, or that less by J cwt., if the beam broke within 
one minute of the weight being applied, being taken to determine the value of the constant S." 
" The screw-jack employed was found convenient for many purpose. Being fitted on the top 
with a horizontal table, it served to raise and lower the scale containing the weights, and thus to apply 
to the beam the desired pressure without jerk; it admitted of such an adjustment of the table as to 
prevent (on the fracture of the beam) the fall of the scale through unnecessary space, and the damage to 
the scale often so occasioned; and it allowed the scale 'to be attached to a fresh beam without removing 
the whole of the weights." 
1865. " Results of a series of experiments on the strength of New Zealand and 
other colonial woods, by J. M. Balfour, C.E., Provincial Marine Engineer of Otago, 
&c." Forming Appendix C of the Report of the New Zealand Exhibition of 1864. (See 
" Captain Fowke's results " above.) 
1886. ' The strength and elasticity of Ironbark timber as applied to Works 
of Construction." by W. H. Warren (Proc. Roy. Soc. N.S.W., xx, 261, 1886). 
Some previous experiments are also quoted. In this paper Professor Warren 
(besides the experiments performed by himself) alludes to two experiments on the 
transverse strength of beams of Ironbark not referred to above. 
1886. Railway Bridges Enquiry Commission. Report of the Royal Commission 
appointed to inquire into the stability of ... and also of the timber approaches 
to the bridge over the Murrumbidgee River at Wagga Wagga. (Sydney, Government 
Printer, 1886). 
Special Reports: Wagga Wagga Viaducts, p. 94; Clyde Experiments on 
Timber, p. 97 ; Strength and elasticity of colonial timber (Ironbark and Red Gum), 
p. 99. 
See also 1885, Victoria, above, p. 419. 
1887. Warren, W. H. " The strength and elasticity of New South Wales 
timbers of commercial value " (1887). Perpared for the Adelaide Jubilee Exhibition 
(1887) and the Melbourne Centennial Exhibition (1888). 
The paper is illustrated by numerous plates showing the apparatus employed, 
and also showing graphically the stresses to which the timbers were subjected. An 
auotgraphic stress-strain apparatus (designed by Professor Warren and Mr. J. A. 
McDonald) was used. 
1889. Warren, W. H. " The transverse strength of Australian timbers." 
Read before the Engineering Association of New South Wales. Building and Engineering 
Journal, Sydney, 22nd July, 1889, p. 452. 
While it mainly deals with New South Wales timbers, it also takes cognizance 
of some Victorian, South Australian, and Western Australian ones. 
