Tensile Strength of Colonial Timbers. 9 



IV. Steingybark. Eucalyptus macrorrhyncha. Bullarook. 



Lbs. per in. 



a. 11,700. Broken. Long fracture. 



b. Stood at 14,000 ; entirely pulled through at 20,000. 



c. 23,000. Broken. Very long fracture. 



d. 23,400. Broken. Very long fracture. 



The first specimen tested was probably an inferior piece. 



V. Blackwood. Acacia melanoxylon. Tasmania. 



Lbs. per in. 



a. 26,500. Entirely pulled through. 



b. 24,000. Slightly broken ; mostly pulled through. 



c. 32,000. Slightly broken ; mostly pulled through. This 



extraordinary result was obtained from a 

 specimen of the form shown in figure 3. 



d. 20,000. Broken. Long fracture. Received a jerk, on 



which it broke. 



e. 23,000. Broken. Long fracture. 



d and e were of a different wood from those before ; 

 much lighter in colour, more open in grain — evidently 

 younger wood, and ill seasoned. 



a, b, c, were from fine, close-grained, dark-coloured wood, 

 well seasoned and extremely hard. c shows round the 

 fractured part fibres like threads of silk. 



VI. Red Deal. Finns silvestris. Baltic. 



Lbs. per in. 



a. 12,000/13,000. Broken. Short fracture. 



b. 8,000/10,000. Broken. Short fracture. This speci- 



men had an area of J in. 



c. 13,800. Broken. Short fracture. 



d. 8,000/9,000. Broken. Short fracture. 



VII. Kauei. Dammar a Australis. New Zealand. 



Lbs. per in. 



a. 10,000/12,000. Broken. Short fracture. Specimen 



ar>ea, J in. 



b. 10,000/11,000. Broken. Short fracture. 



c. 9,100. Broken. Short fracture. 



C 



