ON THE STRENGTH OF WOODS, ETC. 275 



In the above Table I is the length between the supports, b the 



3 I 

 breadth, d the depth, W the breaking weight, B = W g i j 2 > W 



L* 



is the weight answering to / the deflection , and E = W" ,, „ ,. • 



A is the interior diameter of the bamboo, and D the exterior. 



For *> B = t f 2JMA> and E = ( 3 . 6/ x D^J ) ■ 



-5- = .E and -5- = # in the table of data, page 150, in the edi- 

 tion of Professor Barlow's work, published in 1837. 



The following particulars I obtained from an intelligent Chi- 

 nese carpenter at Singapore, named Ah-See-Ah. 



Dabu, Dagu, or Dawu, is used for beams in houses, piles, 

 &c. It is a strong durable wood, and grows to a large size. 



Marbow is used for furniture, windlasses, handspikes, ship gun- 

 carriages. It is a very fine wood, but does not grow so large as 

 the preceding. 



Eranji. — The strength of this wood is very remarkable, being 

 more than double that of oak. The Chinese use it for the stern- 

 posts of their junks and for anchors, and they export it from Sin- 

 gapore. A log 24 feet long and 1J foot square is worth ten 

 dollars. 



Damalaut and Tampeenus are usedfor beams and posts in houses, 

 and for joists. Damalaut cracks and shrinks, lasts long, except 

 in water, where worms destroy it. It grows to 90 feet in length 

 by 2J feet square. Piles 24 feet long and 1 foot square cost at 

 Singapore four dollars each. The Chinese exchange the masts 

 they bring from China for Singapore Damalaut. A mast worth 

 one hundred dollars at Singapore will sell for five hundred in 

 China. 



Tampeenus is very difficult to saw, but is a good wood, lasting 

 long, not injured by exposure, and not so liable to crack as 

 Damalaut. 



The Siraya or poon is the most abundant wood in Singapore. 

 Small spars are called Bintango. The best sort of poon is grown 

 on the hills, and called Batu Siraya. It is distinguished by 

 white fibres running lengthwise. The Siraya grows to 100 and 



