TRANSVERSE TESTS OF AUSTRALIAN AND FOREIGN TIMBERS. 167 



The foreign timbers tested are those mostly found on the 

 Sydney market to-day, and the results should be useful 

 for comparison with the local article. 



III. Description of Apparatus used in making the Tests. 



The specimens tested were 3" x 3" in cross section, and 

 37" long. These were measured in cross section to '01 of 

 an inch, and were tested on a span of 36" in the 25 ton 

 Olsen screw power testing machine in the Technical College 

 Testing Laboratory. The deflections were observed with 

 a deflectometer consisting of a straight edge resting on 

 pins placed in the neutral layer of the test specimens at 

 points just over the bearings. The errors due to crushing 

 of the fibres at the bearings were thus eliminated. By 

 means of a pointed lever working at the centre of the 

 deflectometer, the deflections were magnified, so that it 

 was possible to read to *001 of an inch without difficulty. 

 Mr. A. H. Martin gave great assistance with the testing 

 and reduction of the observations. 



IV. Tabulated Results. 



Species in botanical sequence. 



Botanical Name. 



Breaking 

 Load, in 



Modulus of 

 rupture in 



Modulus of 

 elasticity in 



Eate of 

 Load in 



(Common Name.) 



Pounds. 



lbs. per 

 sq. inch. 



lbs. per 

 square inch. 



lbs. per 

 minute. 



N.O. Sterculiace^:. 











1. Tarrietia argyrodendron ... 



8,000 



18,060 





727 



(Crow's Foot Elm) 











2. do. do. 



7,400 



14,473 





493 



3. do. do. 



8,000 



14,348 





800 



N.O. Meliacejs. 











1. Flindersia australis 



6,320 



13,253 



2,549,610 



742 



(Colonial Teak) 











2. do. do. 



8,000 







... 



1. Flindersia Chatawaiana ... 



5,985 



14,267 



1,379,087 



427 . 



(Queensland Maple) 











2. do. do. 



6,050 



11,427 



2,068,631 



504 



1. 



7,790 



15,580 



2,584,615 



556 



(Mararie) 











2. do. do. 



7,540 



14,685 



2,767,205 



580 



3. do. do. 



8,345 



14,502 



2,272,207 



642 



