| Percy Gaillemard L. Smith - 1879 - 550 pages
...Sometimes a recurrence of exceptionally warm or moist weather will produce a second ring in the same year. As the tree increases in age, the inner layers are filled up and hardened, becoming what is called " duramen," or " heartwood." The remainder is called " alburnum," or " tapwood." The sapwood is softer... | |
| Building - 1891 - 324 pages
...is a column of pith p from which planes, seen in section as thin lines mm, radiate toward the bark, and in some cases similar lines mm converge from the...durability, and should alone be used in good work. Characteristics of good Timber. — Good timber should be from the heart of a sound tree — the sap... | |
| Henry Fidler - Construction industry - 1891 - 322 pages
...obliquely, a beautiful figured appearance, known as " silver grain " or " felt." HEARTWOOD AND SAPWOOD.—As the tree increases in age the inner layers are filled...durability, and should alone be used in good work. Characteristics of good Timber.—Good timber should be from the heart of a sound tree—the sap entirely... | |
| Building - 1892 - 566 pages
...Sometimes a recurrence of exceptionally warm or moist weather will produce a second ring in the same year. As the tree increases in age, the inner layers are filled up and hardened, becoming what is called " duramen," or " heartwood" 1 The remainder is called " alburnum," or " sapwood." The sapwood is softer... | |
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