AS APPLIED TO WORKS OF CONSTRUCTION. 275 
that the maximum shearing stresses are fully pr a Bie and it 
only remains now to show that the beam is not weakened by 
cutting ‘ide for the keys. The curve MQ Prieta to scale 
the bending moments on the beam, due to an evenly distributed 
load of 340 tons; the curve Jf P represents the moments of 
resistance, whieh have been calculated for the reduced section of 
mo 
curve of bending moments, showing that the section left after 
cutting the key holes is ample for the stress that comes upon it, 
and that the beam as compounded of three sages beams is 
via in strength to a solid beam of equal scantli 
. not so late, he would have liked to ‘sais a few remarks 
w the before the meeting, but he must content himself by 
thiiecey Prutenior Warren for his most valuable and interesting 
paper, containing as it does data, which every engineer in this colony 
has felt the need of and been unable to obtain with accuracy. The 
tests have evidently been most carefully made, and the results are 
proportionately valuable. he members will look forward with 
interest to the further paper on this subject which Professor 
Mr. Cas. Moore said that the remarks of Professor Warren 
opened out an interesting discussion, inasmuch as our nore are 
mie valuable in accor rdance with the way in which they 
obtained. Timber in this country is cut all ‘the year round, whisk 
isa ans mistake. If an oak tree be cut down when in P 
the chances are ae rH twelve months time fungus or dry-rot will 
be found to exist i The timbers of the Exhibition of 1862 
— selected by Sir William Macarthur and himself. They took 
re that the wood was collected only at the proper time. Some 
of t this aaa could now be seen in the ate Museum. Some 
ironbark stated that he had tried five kinds, and had found the 
white ironbark of Illawarra to be the strongest. 
r. TrEvor Jones, C.E., said that engineering in this colony 
has been a from the want of = cae there being no 
lack of theorie The a _ Professo or Warren were 
Petit to Professor Warren, who reduced et to 13,000. 
Bite sure that all the engineers in the colony would desire the 
paper to appear in a published form in its entirety. 
[Six diagrams. ] 
