Download e-book for iPad: Identifying Wood: Accurate Results with Simple Tools by R. Bruce Hoadley

By R. Bruce Hoadley

ISBN-10: 0942391047

ISBN-13: 9780942391046

With a unadorned eye or microscope it is possible for you to to spot a hundred and eighty hardwoods, softwoods amd tropical woods through following the easy concepts defined during this textual content.

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Sample text

Will c 21 Strand o f parenchyma cel l s HYMACTI HAN ITUDHYMA VIE WI1H PARENC CELLS: CROSS-SE ONAL VIEW In cross section, longitudinal paren­ chyma cells can be distinguished by their thin walls (P) and, in some cases, by their dark cell contents (C). (100x) scribed in Chapter 7). If the speck disappears, it was a dust par­ ticle. But p INAL PARENC still be in the same location Longitudinal resin canals show up to varying degrees on ra­ PARENC CELLS: LONG INAL W D LENS When longitudinal parenchyma cells are abundant, as in redwood, the strands of cells are just barely visible with a hand lens on split longitudinal surfaces.

In the kind of temperate climate that prevails across most of the United States, the characteristic annual life cycle includes a growing season and a dormant season. Cell formation in most trees follows this cycle, resulting in visible growth layers or growth rings. These increments are called annual rings when formed as the result of annual growth. Ring width varies from species to species. It also varies within a species from year to year in response to more or less favorable conditions during the growing season.

We may also of the tangen­ tial plane as being perpendicular to the rays - and therefore to the radial plane at that point. In a small sample, growth-ring curvature is so slight as to be inconsequential. But on a gross scale - board surfaces, for ex­ ample - the tangential plane cannot be accurately tangential over a large surface due to the growth-ring curvature. So we compromise and accept the surface of any outer slab from the length of a log as tangential. reality, growth rings are never perfectly their curvature varies from place to place.

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Identifying Wood: Accurate Results with Simple Tools by R. Bruce Hoadley

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