The Technologist. Ed. by P.L. Simmonds, Volume 6

Peter Lund Simmonds

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Página 129 - 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 the height of ten or eleven feet, and are all in full bloom.
Página 129 - The road or path is hemmed in on both sides; the view is completely obstructed ; not an animal is to be seen; and the stems of the thistles are so close to each other, and so strong, that, independent of the prickles with which they are armed, they form an impenetrable barrier. The sudden growth of these plants...
Página 2 - Resolution had one been wanting. Since trees of this size are to be found on so small a spot, it is reasonable to expect to find some much larger on the main and larger isles ; and if appearances did not deceive us, we can assert it. If I except New Zealand, I, at this time, knew of no island in the South Pacific Ocean where a ship could supply herself with a mast or a yard, were she ever so much distressed for want of one.
Página 123 - Wessenfeld, and several experiments give 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 respects 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 eliminated if desirable. "3. The bleaching...
Página 428 - ... where the scattered trees are found in a native state, the woods of which being fallen, the trees are suffered to remain on the ground till they become rotten, and perish. In the course of twelve months after the first season, abundance of young pimento plants will be found growing vigorously in all parts of the land, being, without doubt, produced from ripe berries scattered there by the birds, while the fallen trees, &c., afford them both shelter and shade.
Página 124 - 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 126 - ... 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 191 - ... was ejected in a similar manner, and the contents of the tub stirred with the hand. After the lapse of a minute, the water was poured off, with the exception of sufficient to keep the ova submerged, and fresh water supplied in its place. This also was poured off, and fresh substituted previous to removing the impregnated spawn to the boxes prepared for its reception. The ova were placed in the boxes as nearly similar to what they would be under the ordinary course of natural deposition as possible...
Página 163 - ... world. The principal entrance for men and horses is by an opening at the bottom of a hill, through a long passage hewn in the rock, which, by a steep descent, leads down to the lowest vein of coal. The greatest part of this descent is through spacious galleries, which continually intersect...
Página 127 - ... 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...

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