Waste Products and Undeveloped Substances: Or, Hints for Enterprise in Neglected Fields

R. Hardwicke, 1862 - 430 páginas

Opinião das pessoas - Escrever uma crítica

Não foram encontradas quaisquer críticas nos locais habituais.

Páginas seleccionadas

Outras edições - Ver tudo

Palavras e frases frequentes

Passagens conhecidas

Página 168 - In spring, the clover has vanished, the leaves of the thistles have extended along the ground, and the country still looks like a rough crop of turnips. In less than a month the change is most extraordinary : the whole region becomes a luxuriant wood of enormous thistles, which have suddenly shot up to a height of ten or eleven feet, and are all in full bloom.
Página 158 - Indian corn paper, (maishalm papier, as the inventor calls it,) is now in course of construction at Pesth, the capital of the greatest Indian corn growing country in Europe. Another manufactory is already in full operation in Switzerland, and preparations are being made on the coast of the Mediterranean for the production and exportation on a large scale of the pulp of this new material.
Página 157 - Weissenfeld, who has bought it from the originator, and from several experiments deduced the following results : — 1. It is not only possible to produce every variety of paper from the blades of Indian corn, but the product is equal, and in some cases even superior, to the article manufactured from rags. 2. The paper requires but very little size to render it fit for writing purposes, as the pulp naturally contains a large proportion of that necessary ingredient, which can at the same time be easily...
Página 406 - ... sent from Boston to southern parts, the East and West Indies, &c. ; and as sawdust is solely used in packing, a large trade is also carried on in that article. The icehouses, near the lakes and ponds, are immense wooden buildings, capable of holding 10,000 to 20,000 tons each ; some of them, indeed, cover half an acre of ground. They are built with double walls,— that is, with an inner wall all round, two feet from the outer one ; and the space between is filled with saw-dust, — a non-conductor...
Página 163 - ... and of which an unlimited supply may be obtained. I will now enumerate a few of the different substances which I have examined for the purpose of discovering a proper substitute for rags. Rags containing about 50 per cent. of vegetable fibre, mixed with wool or silk, are regarded by the paper-makers as useless to them, and several thousand tons are yearly burned in the manufacture of prussiate of potash. By a simple process, which consists in boiling these rags in caustic alkali, the animal fibre...
Página 163 - ... that. Six tons of flax straw are required to produce one ton of flax fibre, and by the present mode of treatment all the woody part is lost. By my process the bulk of the flax straw is lessened by partial cleaning before retting, whereby about 50 to 60 per cent, of shoves (a most valuable cattle food) are saved, and the cost of the fibre reduced. By the foregoing it will be seen that the flax plant only produces from 12 to 15 per cent, of paper pulp. All that I have said about flax is applicable...
Página 52 - It is stated that by the mode of preparation employed by M. Pannewitz, the woolly substance acquires a quality more or less fine, or remains in its coarse state. In the former case it is employed as wadding, and in the latter as a stuffing for mattresses. The leaves may be stripped from the trees when quite young without injury, and a man may gather 200 Ib.
Página 164 - ... for paper pulp, but for all kinds of manufactures in which flax, cotton, silk, or wool are employed. It appears that this plant exists in large quantities in Australia, and it is most desirable that some of our large manufacturers should import a quantity of it. The plant wants no other preparation than cutting, drying, and compressing like hay. The bleaching and finishing may be done here.
Página 166 - I examined, and found to contain about 40 per cent, of strong fibre, excellent for paper, and very easily bleached. The only point which was not entirely satisfactory was relative to the abundant supply of it, as this plant is only found in Egypt. I directed, therefore, my attention to plants growing in this country ; and I found to my great satisfaction that the common rushes (Juncus...
Página 82 - Plantain meal is prepared by stripping off the husk of the plantain, slicing the core, and drying it in the sun ; when thoroughly dry, it is powdered and sifted. It is known among the Creoles of the colony under the name of

Informação bibliográfica