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Identifying and Using Hundreds of Woods Worldwide

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Identifying and Using Hundreds of Woods Worldwide WOOD! IDENTIFYING AND USING HUNDREDS OF WOODS WORLDWIDE ERIC MEIER Table of Contents ONE|Foundations: 1 What is Wood? HARDWOODS AND SOFTWOODS | TREE GROWTH | SAPWOOD AND HEARTWOOD PLANES OR SURFACES OF WOOD | GRAIN APPEARANCE | RAYS TWO|Building on Basics: 7 Wood and Moisture DIMENSIONAL SHRINKAGE | WOOD FINISHES AND MOISTURE FINISHING OILY OR RESINOUS WOODS THREE|A Closer Look: 15 Identifying Wood GREAT EXPECTATIONS | FILL IN THE BLANK, OR MULTIPLE CHOICE? DEDUCTIVE WOOD IDENTIFICATION FOUR|Under the Lens: 25 Softwood Anatomy RESIN CANALS | TRACHEIDS | EARLYWOOD TO LATEWOOD TRANSITION GRAIN CONTRAST | PARENCHYMA | RAYS FIVE|Under the Lens: 29 Hardwood Anatomy VESSEL ELEMENTS | PARENCHYMA | RAYS | WOOD FIBERS | MONOCOTS: A SPECIAL CASE SIX|A Kaleidoscope: 39 The Wood Profiles PROFILE FIELDS EXPLAINED | WOOD PROFILES Appendices and 253 Back Matter APPENDIX A: JANKA HARDNESS MASTERLIST | APPENDIX B: MODULUS OF RUPTURE MASTERLIST APPENDIX C: MODULUS OF ELASTICITY MASTERLIST | BIBLIOGRAPHY | ACKNOWLEDGMENTS | INDEX A Brief Introduction: From the Author hen it comes to those who work with wood, there At that point, a line had been drawn in the sand. I Wseems to be generally two classes of people: scien- determined that as I made an effort to learn (and there- tists and craftsmen. This book was written for the latter. after teach others) about scientific wood data and iden- What I have found in my own personal observation tification, I didn’t need to consult with the “other side” of those that work with wood is that the first class of to see what would be most helpful to them: I was the people, the scientists, are almost drowning in knowl- other side! I realized that I was a woodworker, and not edge. Yet the craftsmen, through no particular fault a scientist—and for my purposes, that was not neces- of their own, are suffering in a relative dearth of solid sarily a bad thing. facts and scientific understanding. A friend of mine who works in Bible translation Books on the subject of wood usage and identifica- once told me that in order for a translation to be op- tion have all come from one of two very opposite poles. timally readable and usable for native peoples, it ul- Either there have been craft-oriented books filled with timately must be written by someone whose mother pretty pictures, but with very weak or vague and im- tongue is in the native language, or else it will seem practical statements, such as “this wood is strong, awkward, foreign, and inarticulate. hard, and moderately stable,” or else there have been I am of the opinion that a very similar phenome- thinly-veiled scientific books, burying the uninitiated non happens whenever any attempt is made from the in grainy, black-and-white microscope images and con- scientific community to condescend and “write down” fusing terminology. to craftspeople: the information trying to be relayed is As I began researching and writing this book, many very good and useful, but it’s spoken from an entirely questions began circling in my head. “Can’t a book exist different background and mindset, and is almost com- that features both vivid and accurate pictures, and also pletely lost in translation. solid, usable facts and information on wood species? It’s therefore my hope and intention with this book What’s practically applicable to the realm of woodwork- to act as an interpreter in a way, and to traverse the ing and related trades,s, and wwhathat shoshoulduld be left to vvastast anandd somewsomewhathat iintimidatingntimid territory of scientific the fastidious and exactingacting eeyesyes of scientists?scientists?”” wood knowledge,knowledge, and openope a fresh pipeline of practi- In the midst of thesethese myriadmyriad questions, I ccalal insiinsightght for those who stand to most directly ben- was debating whetherr or not to get a microscope eefitfit frfromom it: it: woodwowoodworkers.rker and delve into the wworldorld of microscomicroscopicpic wowoodod IInn our “laboratory,”“laboratory,” you’ll find no clean white identification. Here Iwas, was, probably probably one one of of the the big big-- ssmocksmocks or stuffystuffy cocollars.lla Come on in, shake the gest wood “nuts” around,und, utterly fascinated by thethe ssawdustawdust from yyourour hhair, brush off those wood many types and varietieseties of wood, when I had an cchipships from youryour shoulders,shou and take a moment epiphany. “If I personallyally don’t have ananyy desire to bubuyy to learn a bitbit more about the material that’s and learn to use a microscopeicroscope to help identifyidentify wood, pprobablyrobably rightright underunder your nose: WOOD! then why in the worldld wouwouldld I ever expect anyone else to either?” Mopane, Olive, Verawood, and Yellow Poplar veneer fountain pen Foundations: 1 What is Wood? t’s common knowledge that wood comes from trees. Softwoods (conifers) tend to have needle or scale- IWhat may not be so apparent is the structure of the like foliage, though in some uncommon instances, wood itself, and the individual elements that make they can have rather broad, flat leaves, such as Kauri up any given piece of lumber. Unlike a mostly homog- (Agathis australis). Most softwood trees are evergreen, enous piece of polystyrene, MDF, or other man-made however, a few conifers, such as Bald-cypress (Taxodi- material, wood is an organic material, and has many um distichum), lose their foliage in the autumn, hence distinct characteristics which will be helpful to learn. the “bald” prefix in the common name. Softwoods tend to have a single, dominant, straight HARDWOODS AND SOFTWOODS trunk with smaller side branches, referred to as an ex- An immediate and broad distinction that can be made current form—this cone-shaped growth form helps between types of trees (and wood) is the label of hard- trees in temperate climates shed snow. Again, there are wood or softwood. This is somewhat of a misnomer, several conifers that are an exception to this growth as the label is actually just a separation between angio- form, such as Cedar of Lebanon (Cedrus libani). sperms (flowering plants such as maple, oak, or rose- The confusion in labels arises in that the wood of wood), and conifers (cone-bearing trees such as pine, angiosperms is not always hard—a glaring example is spruce, or fir). Balsa (Ochroma pyramidale), which is technically classi- Hardwoods (angiosperms) have broad-leaved foli- fied as a hardwood. Conversely, the wood of conifers is age, and tend to be deciduous—that is, they lose their not necessarily always soft —an example of a relatively leaves in the autumn. (However, many tropical hard- hard softwood would be Yew (Taxus spp.). However, wood species exist which are evergreen—they main- as a rule of thumb, hardwoods are of course generally tain their leaves year-round.) Additionally, hardwood harder than softwoods, and the label is still useful to trees tend to have a branched or divided trunk, referred distinguish between two broad groups of trees and cer- to as a dendritic form. tain characteristics of their wood. The spruce tree pictured to the left is a good rep- resentation of a conifer with evergreen, needle-like foliage and a single, dominant trunk. Their long, straight trunks and lightweight timber make soft- woods well-suited for structural building purposes. On the right is an oak tree—with a branching form, and leaves that drop seasonally—which is charac- teristic of most angiosperms. Their higher density and rich heartwood colors make hardwoods well- suited for furniture and decorative woodwork. CHAPTER 1 | Foundations: What is Wood? 1 In this cross section of Green Ash (Fraxi- nus pennsylvanica), the sapwood section Sapwood is disproportionately wider than most hardwood species. In some tree species, Pith the sapwood is less than one inch thick, with the remaining trunk being com- Heartwood posed of heartwood. Ash (Fraxinus spp.), along with maple (Acer spp.), birch (Bet- Bark ula spp.), and a handful of other woods, are utilized mainly for their wide, light- Cambium colored sapwood. Conversely, the darker heartwood is normally the commercially valuable part of the tree, as in domestic species such as Black Walnut (Juglans nigra) and Black Cherry (Prunus serotina). leaves and branches, there are growing points at the TREE GROWTH tips of the stems and roots, called apical meristems. When considering a tree’s growth—whether a tiny These growing points, through cell division, are respon- sapling, or a one-thousand-year-old giant—there are sible for the vertical growth in trees. many features that are common to all species. Besides Additionally, sandwiched between the bark and the the basics of the roots, the main stem (trunk), and the inner wood is a thin layer or sheath called the lateral meristem or vascular cambium—usually referred to simply as the cambium. This tiny, seemingly magical layer is responsible for practically all of the horizontal growth on a tree. The cambium consists of reproductive cells that, by cell division, forms new bark outward, and latewood zone new wood inward. latewood tends to be denser, and has smaller and less fre- It is the seasonal growing activity of the cambium quent pores (hardwoods) or that is responsible for the formation of growth rings smaller diameter tracheids seen in wood. In temperate zones, the cambium is most (softwoods) active in the spring—this wood is sometimes referred to as springwood or earlywood, with growth slowing earlywood zone in the summer (called summerwood or latewood), earlywood tends to be less dense, and has larger pores and completely ceasing in the winter. These differences (hardwoods) or larger diam- in growing cycles from year to year form annual rings, eter tracheids (softwoods) which are a reasonably accurate indicator of a tree’s age.
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