A Guide to the Identification, of Our More Useful Timbers
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| Hersteller: | Forgotten Books (Stone, Herbert) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from A Guide to the Identification, of Our More Useful Timbers: Being a Manual for the Use of Students of Forestry This guide aims at giving information on certain points which are not easily accessible elsewhere or have hitherto been treated in a manner unsuitable to our purpose. It is therefore assumed that the reader has sufficient knowledge of the elementary structure of wood, to follow the descriptions. Two objects are kept in view: firstly the observation of the characters of the different species, and secondly the utilization of those characters to discriminate between one species and another. No so-called "specific gravities" are given, since those so far recorded are taken either from long series of well-worked species which have so wide a range as to be quite useless for comparison (for instance between 0·45 and 0·90 for the Scots Fir), or from short series of less familiar woods (say 0·70 and 0·75); the latter, in spite of appearing to vary but little, may average the same as the former. Hence the rather vague terms "heavy," "moderately heavy," and so on are used, since at least they do not mislead. The illustrations are restricted to figures (taken from photographs of sections in the Cambridge Research laboratory) which are deemed necessary where the critical detail can be seen only by means of the microscope or where such detail is a difference of degree and not of kind. The Generic numbers attached to the species are those of Bentham and Hooker´s Genera Plantarum, according to which system, the specimens of wood in the collection of the School of Forestry are arranged. Any specimen needed for comparison can be found immediately by means of these numbers. Every effort has been made to find points of difference in kind, those of degree, such as the varying size or numbers of the rays and vessels, etc., or the colour, hardness, weight, etc. not being reliable. This has been done satisfactorily in all cases except those of the Poplars, Willows and Horse Chestnut, a most difficult group, the Common and Wych Elms, and the Mahoganies: all these cases demand a training of the senses only to be acquired by the handling of many specimens. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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