This section is from the book "Elementary Principles Carpentry", by Thomas Tredgold. Also available from Amazon: Elementary Principles Of Carpentry.
This wood is abundant in the Burman forests, in Southern India, and the Eastern Islands. It is a tall, straight tree, usually attaining about 6 feet in girth, and resembles a dull-coloured and greyish specimen of mahogany. It is used for the decks, masts, and yards of ships, for which it appears to be well adapted, owing to its strength and lightness. The texture is coarse and porous, but uniform. It is easy to saw and work up; it holds nails well, but is not durable in damp situations.
The mean weight of a cubic foot, unseasoned, is about 55 lbs., and when seasoned about 40 lbs.
The cohesive force of a square inch is from 10,000 to 14,700 lbs. The weight of the modulus of elasticity for 1 square inch is 1,689,800 lbs.
The specific gravity, and the relative strength, stiffness, and resilient power, compared with Riga "fir," which is taken as 1000, are as under: -
Specific Gravity. | Strength. | Stiffness. | Resilience. | |
.579 | 1380 | 1270 | 1400 | Barlow. |
.647 | 1226 | 1230 | 1146 | Fincham. |
.613 | 1303 | 1250 | 1273 | Mean. |
 
Continue to: