Steam-pumps are here in force—direct by Tangye and others, and rotary by both of the Gwynnes, whose name has been so long and is so intimately associated with this class of machines.
The emery-wheels of Thompson, Sterne & Co. of Glasgow have the same variety of form and application usual with us, but the firm claims that while it uses the true corundum emery of Naxos, the American article is only a refractory iron ore, which soon loses its sharpness and becomes inefficient. This is a question of efficiency or of veracity which we leave to the trade. The machine adapted as a tool-grinder has six emery-wheels for varying characters of work. Four are assorted for gauges of different radii, for moulding-irons, etc. One has a square face for plane-irons, chisels, etc. One is an emery hone to replace the water-of-Ayr stone.
In examining the English locomotives exhibited two things were apparent: one half of them have adopted the outside cylinders and wrist-pins on the drivers, three out of four have comfortable cabs for the engineers. These are, as we view them, sensible changes. Outside-cylinder engines are also coming into extensive use in France. The machine tools shown by Sharp, Stewart & Co. of Manchester are remarkably well made, and their locomotive in the same space is an evidence of the efficiency of the tools.
The exhibit of hydraulic-machine tools by Mr. R. H. Tweddell is a very admirable one, and shows a multitude of stationary and portable forms in which the idea is developed so as to reach the varying requirements. When work is more conveniently held to the machines, the latter are adapted to reach it whether presented vertically or horizontally, or with one arm inside of it, as with boilers and flue-pipes. When it is more convenient to handle the riveter, the latter is suspended from a crane and swung up to its work, and the peculiarity of the various sizes and shapes for different kinds of work is remarkable. The cut shows one of the latest for riveting girders.
The Ingram rotary perfecting press, on which the Illustrated London News is worked off, prints from a web of paper of the usual length, and is claimed as the final triumph in the line of inventors, which is thus stated in England: Nicholson, König, Applegarth and Cowper, Hoe and Walter. We should be disposed to add a few names to the list, among which would be Bullock and Campbell. A is the roll of paper, containing a length of, say, two miles; B B the type and impression cylinders for printing the inner form; C C calendering rollers to remove the indentation of the inner form type; D D the outer form type and impression cylinders; E E cylinders with a saw-tooth knife and an indentation respectively to perforate the sheet between the papers; F F rollers to hold the sheet while the snatching-rollers G G, which run at an increased speed, break the paper off where it has been indented by E E. The folder is in duplicate to give time to work, as each only takes half the papers. The vibrating arm H delivers the sheets alternately to K and J, which are carrying-tapes leading to two folding-machines. If the sheets are not required to be folded, the arm H is moved to its highest position, and there fixed, without stopping the machine: it then delivers the sheets to the roller L, and by means of a blast of air and a flyer they are laid on a table provided for them.
The rise of British factory-life and great energy in manufacturing began with the invention of the spinning-frame by Arkwright, the power-loom by Cartwright, the spinning-jenny by Hargreaves, and the mule by Crompton—all within a space of twenty years ending 1785. To these must be added the steam-engine by Watt, which made it possible to drive the machinery, and the gin by Eli Whitney, which made it possible to get cotton to spin. Much as iron has loomed up lately, the working of the various fibres—cotton, wool, flax, hemp and jute—constitutes the pet industry of her people, and very elaborate and beautiful are the machines at the Exposition, especially attractive and less commonly known being those for working long or combing wool, flax, hemp and jute. The United States is not doing as much as it ought in the working of these fibres, and the money which is paid for the purchase of foreign linens and fabrics made of other materials than cotton and wool might, some economists think, be employed at home in making them. The day will come probably, but does not seem to be hastening very fast, when we shall conclude to make our own linens, as we have within a comparatively few years past determined in regard to all the staple varieties of carpets.
INGRAM'S ROTARY PERFECTING PRINTING-MACHINE.
One of the most important machines in the Exposition, from the American point of view, is the "double Macarthy roller-gin," exhibited by Platt Brothers & Co. of Oldham, England. It is a curious instance of how machines sometimes revert to their original types. The oldest machine for ginning cotton is undoubtedly the roller-gin, and it was known in India, China and Malaysia long before Vasco da Gama turned the Cape of Good Hope and opened the trade of the East to the Portuguese and their successors. The common roller-gin of Southern Asia was shown at the Centennial from Hindostan, Java and China, and is exhibited here from Java. It has a pair of rollers about the size of broomsticks, close together and turning in different directions, which pinch and draw the fibre through, while the seeds are prevented from passing by the closeness of the rollers. Whitney's invention of the saw-gin in 1794 revolutionized the business and changed the whole domestic aspect of our Southern States. In it the fibre is picked from the seed by means of saw-teeth projecting through slits in the side of the chamber in which the seed-cotton is placed. But the roller-gin has again come upon the stage, and with the late improvements is likely to become the gin of the future. When the close of our civil war put an end to the "cotton famine," as it was called, in Europe, and American cotton resumed its place in the market, the export of the East Indian and Egyptian cottons would have been immediately suppressed if they had not possessed the roller-gin in those countries. Ten thousand of the double Macarthy gin are used in India, and five thousand of the single roller-gin in Egypt. It is understood that the saw-gin is used in but a single district in India. While the saw-gin injures any variety of cotton by cutting, tearing, napping and tangling the fibres, its action upon the long and fine staple called "sea island" is ruinous, and the roller-gin alone is suitable for working it. The slow action of the single roller-gin, cleaning about one hundred and fifty pounds of lint per day, made its cultivation too expensive, but the double roller-gin will clean nine hundred pounds in ten hours, or one hundred and twenty pounds an hour of the common upland short-staple cotton. It is thought by Southern members of the United States commission that the introduction of the double roller-gin into our country would greatly increase the profitableness of the culture of cotton, and especially of the "sea island," which is at present much neglected, and in the growth of which we need fear no rivalry. Each roller is made of walrus leather, and rotates in contact with a fixed knife, dragging by its rough surface the fibres of cotton between itself and the knife. A grating holds the seed-cotton. Besides these parts there are moving knives to which are attached a grid or series of fingers. At each elevation of the moving knives, the grids attached thereto lift the cotton to the elevation of the fixed knife-edge and of the exposed surface of the rollers: on the descent of each moving knife the seeds which have become separated from the fibre are disentangled by the prongs of the moving grid passing between those of the lower or fixed grid about seven hundred and fifty times per minute, and are by this rapidity of action flirted out.
It would be scarcely fair to neglect altogether the English annex in which all the agricultural implements are exhibited, nor that which contains its carriages. So much commercial intercourse, so many journals published in the respective countries, have made each pretty well acquainted with the agricultural machines and methods of the other. The principal difference is in the splendid plant for steam-ploughing exhibited by Fowler & Son and by Aveling & Porter, and in the great number and variety of the machines and apparatus for preparing food for animals—chaff-cutters, oat- and bean-bruisers and crushers, oilcake-grinders, boilers and steamers for feed and mills for rough grinding of grain.