ISBN: 9780217404693

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustra… More...

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844. Excerpt: ... CHAPTER VI. ELEMENTS OF WOOD. OXYGEN, HYDROGEN, AND CARBON. VEGETABLE AND ANIMAL SUBSTANCES. IVORY AND BONE. PHOSPHATE OP LIME. SILVER. BRASS. ALLOYS. COMPOSITION OP FLINTGLASS. BLACK-LEAD PENCILS. INDIA-RUBBER. WAFERS. RED AND BLACK SEALING-WAX. SHELL-LAC. LACQUER. VARNISH. VENICE TURPENTINE. VERMILION. LAMP-BLACK. RED AND BLACK VARNISH. COINING. ELECTRICAL ATTRACTION AND REPULSION. CONDUCTORS AND NON-CONDUCTORS. ELECTRIC LIGHT. ELECTRICAL EXCITATION. ELECTROSCOPE. CONCLUSION. What are the elements of the wood of which The Writing-Desk is made? If the chemist can analyse wax, surely he can analyse wood! Such is the case, and he discovers that all kinds of wood consist of the same elements as wax, namely,--oxygen, hydrogen, and carbon. The proportions, or weights, of these three elements in wood are not quite the same as in wax, for wax contains more hydrogen; but they are so singularly adjusted, that the oxygen and hydrogen are in the exact proportions to constitute water. The chemist, therefore, may call wood, a compound of water and charcoal. One hundred parts of wood, accurately analysed, yield fifty parts of water and fifty parts of charcoal. It is an extraordinary, but nevertheless a true, conclusion to draw, that wood is actually composed of fuel forjire, and of water for its extinction. Paper is made for the most part from linen rags, and the threads of these were spun from flax, a vegetable substance, as truly wood, chemically speaking, as the wood of the writing-desk, the ruler, the knifehandle, or the cedar pencil, only a much finer fibre. The reduction of these rags to pulp, during papermaking, did not change the relations of their chemical elements or composition; it has only broken them up into a state of exceedingly minute mechanical divi... Thomas Griffiths, Books, Fiction and Literature, Fiction, The Writing-desk And Its Contents; Taken As A Text For The Illustration Of Facts In Natural History And Philosophy. Taken As A Tex Books>Fiction and Literature>Fiction, General Books LLC<

ISBN: 9780217404693

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustra… More...

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844. Excerpt: ... CHAPTER VI. ELEMENTS OF WOOD. OXYGEN, HYDROGEN, AND CARBON. VEGETABLE AND ANIMAL SUBSTANCES. IVORY AND BONE. PHOSPHATE OP LIME. SILVER. BRASS. ALLOYS. COMPOSITION OP FLINTGLASS. BLACK-LEAD PENCILS. INDIA-RUBBER. WAFERS. RED AND BLACK SEALING-WAX. SHELL-LAC. LACQUER. VARNISH. VENICE TURPENTINE. VERMILION. LAMP-BLACK. RED AND BLACK VARNISH. COINING. ELECTRICAL ATTRACTION AND REPULSION. CONDUCTORS AND NON-CONDUCTORS. ELECTRIC LIGHT. ELECTRICAL EXCITATION. ELECTROSCOPE. CONCLUSION. What are the elements of the wood of which The Writing-Desk is made? If the chemist can analyse wax, surely he can analyse wood! Such is the case, and he discovers that all kinds of wood consist of the same elements as wax, namely,--oxygen, hydrogen, and carbon. The proportions, or weights, of these three elements in wood are not quite the same as in wax, for wax contains more hydrogen; but they are so singularly adjusted, that the oxygen and hydrogen are in the exact proportions to constitute water. The chemist, therefore, may call wood, a compound of water and charcoal. One hundred parts of wood, accurately analysed, yield fifty parts of water and fifty parts of charcoal. It is an extraordinary, but nevertheless a true, conclusion to draw, that wood is actually composed of fuel forjire, and of water for its extinction. Paper is made for the most part from linen rags, and the threads of these were spun from flax, a vegetable substance, as truly wood, chemically speaking, as the wood of the writing-desk, the ruler, the knifehandle, or the cedar pencil, only a much finer fibre. The reduction of these rags to pulp, during papermaking, did not change the relations of their chemical elements or composition; it has only broken them up into a state of exceedingly minute mechanical divi... Thomas Griffiths, Books, Fiction and Literature, Fiction, The Writing-desk And Its Contents; Taken As A Text For The Illustration Of Facts In Natural History And Philosophy. Taken As A Tex Books>Fiction and Literature>Fiction <

ISBN: 0217404693