XX.] INDIAN TEAK. 193 



same dimensions as above, the results gave, as the mean 

 breaking weight, 220 lbs. to the square inch, which is 

 less than the average of the four varieties just mentioned, 

 and 32 lbs. below the average of the three first-named ; 

 the Laingbooe being struck out as not likely ever to be 

 imported in sufficient quantities to affect the results 

 when applying Teak to building purposes. The dif- 

 ference is against the specimens tried in England, but 

 this may be attributed mainly to the more seasoned state 

 of the pieces, and, perhaps, in part, to better appliances 

 for testing. 



The mean deflections of the twelve pieces referred to 

 were, when weighted to 390 lbs., 1791 inch, and with the 

 breaking weight of 878 lbs., S'9i6 inches. From these 

 results it appears, by the application of the formulae used 

 by Professor Barlow, that the strength is represented by 

 2303, and the elasticity by 530970. The same pieces 

 being tested for tensile strength, took a strain nearly 

 equal to 6 tons to overcome the direct cohesion, or about 

 3,301 lbs. to the square inch. 



A number of cubes of this timber were subjected to 

 a crushing force in the direction of the fibres, and these 

 generally gave way under a pressure of about 2j^ tons 

 per superficial inch of base. Altogether, some fifty- 

 three experiments of this kind were made upon Teak, 

 four being on pieces 2 x 2 of various lengths, others were 

 3x3, varying by i inch from 8 to 18 inches in length, 

 the piece of 16 inches proving to be the strongest, and 

 taking 2875 tons to crush it ; then there were pieces 

 4x4, and severally varying by i inch from 15 to 24 

 inches in length, the piece of twenty inches proving to be 

 the strongest, and t^ing 42 tons to crush it. Again, 

 there were pieces 6x6, and severally varying by 3 inches 

 from 12 to 30 inches in length, the piece 18 inches in 



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