EUCALYPTUS GLOBULUS.. 



knightheads, hawse-timbers, apron, deadwood, kuees, rudder, windlass, timber- and bilge-strakes 

 and ceiling between, clamps, stringers, shelf-pieces and lower deck-waterways, 9 years ; for light 

 watermark to wales, topsides, sheer-strakes, upper deck-waterways, spirkiting and plank-sheers, 8 

 years ; keel to first futtock-heads, thence to light watermark, 12 years. The wood of the Blue 

 Gum-tree is also very extensively used by carriage-builders and manufacturers of implements ; for 

 instance, for poles and shafts of light as well as heavy vehicles, for under-carriage work, swivel- 

 trees, spokes and rims, axle-beds, plough-bars, handles of axes, picks, shovels, forks, hoes and 

 hammers and all similar purposes. It is further used for telegraph-poles and for planking for 

 bridges and jetties ; for structures in water and for railway-sleepers it was formerly largely 

 employed, but during the latter years it has given place to the wood of E. rostrata for these 

 purposes. Rural settlers use the Blue Gum wood for fencing, especially for rails, when readily 

 attainable. The Marquis Chateauvieux and Sir George Bowen mentioned to the author, that B. 

 rostrata is reared in such places of Bourbon and Mauritius as are exposed occasionally to violent 

 storms, where E. globulus, though not really fragile, is more apt to break than E. rostrata. 



Results of Experiments on the strengtii of Blue-Gum Timber instituted by Mr. James Mitchell, 

 pieces subjected to test were 7 feet long by 2 inches square. 



The 





Deflection. 





Total Weight 

 required to 



break 

 each piece. 



Value 

 of Strength 

 Iw 



Direct 



cohesion 



(Tensile 



Strength) per 



square inch. 







Weight and Deflection while 

 the Elasticity remained perfect. 



Deflection at 



the crisis 

 of breaking. 



Speciflc 

 Gravity. 





Weight in— 



Deflection in — 







lbs. 



inches. 



inches. 



lbs. 





lbs. 





No. 4, seasoned 8 months ... 



294 



1-5 



7-5 



819 



2,149 





1-076 



No. 5, seasoned 8 months ... 



503 



1-375 



5- 



867 



2,276 





1-034 



No. 6, seasoned 2 to 3 years 



472 



1-375 



6-5 



1,029 



2,701 



28,784 



1-054 



No. 7, seasoned 4 to 5 years 



413 



1-376 



6- 



1,043 



2,737 



27,440 



1-078 



No. 8, seasoned 2 to 3 years 



567 



1-75 



7-6 



1,113 



2,921 



22,064 



■987 



No. 9, seasoned 4 to 5 years 



434 



1-375 



6- 



1,113 



2,921 



27,472 



1-071 



No. 10, seasoned 3 years ... 



496 



1-625 



5-25 



1,122 



2,945 



31,088 



■942 



No. 15, seasoned 20 years* ... 



518 



1-626 



4- 



1,330 



3,491 



28,336 



1-089 



* Part of an old door-post. 



Results of Experiments instituted by Mr. Laslett on the strength of Blue-Gum Timber. The pieces 

 subjected to trial were 7 feet long by 2 inches square. The weight was suspended in the middle, 

 both ends free. 



EXPEEIMENTS ON TrANSVEESE StEBNGTH. 



Each piece broke witli a short fracture. 

 S = 1,869. 







Deflections. 









Number ol the 

 Specimen. 









Total Weight required to 

 break each piece. 





with the Apparatus 

 weighing 300 lbs. 



After the Weight was 

 removed. 



At the crisis of 

 hreuklng. 



Spoclflc Gravity. 





Incho.". 



inches. 



inclies. 



lljs. 





1 



1-25 



■15 



4-50 



767 



1-079 



2 



1-75 



•20 



y-75 



002 



•997 



3 



1-35 



■10 



5-75 



710 



1-037 



4 



1-00 



-00 



3-75 



767 



1-108 



5 



1-25 



•15 



3-50 



084 



1-020 



6 



1-00 



-00 



4-00 



741 



■924 



Average 



1-26 



-10 



4-21 



712 



1-029 



