TIMBERS. 497 
affect its tensile strength to any extent. It was known locally as 
*‘Messmate.’’ Rankin gives the following particulars in regard 
to the timber of Z. gtgantea (obligua): modulus of elasticity in 
pounds on square inch, 1,709,000; modulus of rupture, 13,000 ; 
weight, 54lb. per cubic foot. 
EXPERIMENTS ON THE TRANSVERSE STRENGTH OF THE Woop oF 
£. obliqua, by Baron Mueller and J. G. Luehmann. The 
specimens were 2ft. long and 2in. square. 
Deflection. Total Specific Gravity. 
weight | Value of | 
required | strength, 
With to | 
the apparatus| At the crisis | break each | S = pel Air-dried. Eee 
weighing | of breaking.| piece. 4BD? nee. 
78olb. | 
Inches, Inches. Vpoands: az ie 
ca .50 2053 1540 LOA5- Fe. 807, 
14 48 1776 1332 935 | -783 
TASMANIAN “STRINGYBARK.” (Z. obliqua.) 
(Experiments by Mr. James Mitchell,* see p. 338.) 
| 
g E S, 
S 2 Value of 
wd Val f£ } 
Se Name of Wood, etc., Specific Elasticity. Strength. | 
ops 4ft. long and 2in. square. Gravity. 12w’ es 
Zz = L= aaa es jad2 
3 a 
I Green piece, brown coloured, 7ft. long, 
Cen piece, pe eae 919 9661075 1856 
2 Do. reversed grain... “00 919 9305452 1932 
3 Do. white coloured... oe 498 4550976 1958 
4 Do. do. dice fee 866 9313920 1958 
5 Seasoned upwards of 6 years ... eee 925 9506060 2554 
6 Do. do. TOU va sae Pre 864 12583561 2551 
4 Do. do. se} Air Bae sie 947 13869273 2514 
8 Do. do. 2ON sm sss $50 847 9927863 2564 
9 Do. do. BO) 0 557s ox 838 10281134 2598 
* Attached to the results was the following note:—“ The results are also given of a 
series of experiments on the Stringybark, a gum wood extensively used in this and the 
neighbouring colonies for house building and general purposes. The specimens 
experimented upon were chosen because their ages were vouched by the gentlemen who 
supplied them, and not on account of their being specially calculated to sustain great 
weights. Pieces could, I have no doubt, be found capable of bearing greater weights 
than any I have recorded.’’ ; 
2K 
