BRIDGE, CONEAUT RIVER.
He now proceeded to attempt a remedy of the two grand defects of Newcomen’s engine—the necessity of cooling the cylinder before every stroke of the piston, by the water injected into it; and the non-employment of the machine, for a moving power, of the expansive force of the steam. On account of the first defect, a much more powerful application of heat than would otherwise have been requisite was demanded for the purpose of again heating the cylinder, when it was to be refilled with steam. To keep this vessel, therefore, permanently hot, was the grand desideratum; and Watt at length hit upon an expedient equally simple and successful. His plan was to establish a communication, by an open pipe, between the cylinder and another vessel, the consequence of which would be, that when the steam was admitted into the former, it would flow into the latter, so as to fill that also. Supposing, then, that the steam should here only be condensed, by being brought into contact with cold water, or any other convenient means, a vacuum would be produced, into which, as a vent, more steam would immediately rush from the cylinder; this steam would also be condensed; and so the process would go on, till all the steam had left the cylinder, and a perfect vacuum had been effected in that vessel, without so much as a drop of cold water having touched or entered it. The separate vessel alone, or the condenser, would be cooled by the water used to condense the steam; which, instead of being an evil, would tend to quicken and promote the condensation. Experiments fully confirmed Watt in these views; and the consequence was, not only a saving of three-fourths of the fuel formerly required to feed the engine, but a considerable increase of its power.
In overcoming this difficulty, Watt was conducted to another improvement, which effected the complete removal of what we have described as the second radical imperfection of Newcomen’s engine, namely, its non-employment, for a moving power, of the expansive force of the steam. The effectual way, it occurred to him, of preventing any air from escaping into the parts of the cylinder below the piston, would be to dispense with the use of that element above the piston, and to substitute there likewise the same contrivance as below, of alternate steam and a vacuum. This was to be accomplished by merely opening communications from the upper part of the cylinder to the boiler, on the one hand, and the condenser on the other; and forming it, at the same time, into an air-tight chamber, by means of a cover, with only a hole in it to admit the rod or shank of the piston, which might, besides, without impeding its freedom of action, be padded with hemp, the more completely to exclude the air. It was so contrived, accordingly, by a proper arrangement of the cocks, and the machinery connected with them, that while there was a vacuum in one end of the cylinder, there should be an admission of steam into the other; and the steam so admitted now served, not only by its susceptibility of sudden condensation, to create the vacuum, but also, by its expansive force, to impel the piston.
These were the principal fundamental improvements in an engine, which has since been brought to such perfection of action and power, as to form one of the most triumphant eras in the history of human ingenuity. Instead of entering into all the subsequent contrivances which Watt invented, we cannot give a better idea of his splendid success, than by quoting the language of a recent writer. ‘In the present state of the engine, it appears a thing almost endowed with intelligence. It regulates, with perfect accuracy and uniformity, the number of its strokes in a given time, counting or recording them, moreover, to tell how much work it has done, as a clock records the beats of its pendulum; it regulates the quantity of steam admitted to work; the briskness of the fire, the supply of water to the boiler; the supply of coals to the fire; it opens and shuts its valves with absolute precision as to time and manner; it oils its joints; it takes out any air which may accidentally enter into parts which should be vacuous; and, when anything goes wrong, which it cannot of itself rectify, it warns its attendants by ringing a bell; yet, with all these talents and qualities, and even when exerting the power of six hundred horses, it is obedient to the hand of a child; its aliment is coal, wood, charcoal, or other combustible; it consumes none while idle; it never tires, and wants no sleep; it is not subject to malady when originally well made, and only refuses to work when worn out with age; it is equally active in all climates, and will do work of any kind; it is a water-pumper, a miner, a sailor, a cotton-spinner, a weaver, a blacksmith, a miller, etc., etc.; and a small engine, in the character of a steam pony, may be seen dragging after it, on a railroad, a hundred tons of merchandise, or a regiment of soldiers, with greater speed than that of our fleetest coaches. It is the king of machines; and a permanent realization of the genii of eastern fable, whose supernatural powers were occasionally at the command of man.’
Watt had, however, another difficulty to surmount; that of bringing his invention into practice. Having no pecuniary resources of his own, he applied to Dr. Roebuck, who had just established the Carron iron works, to advance the requisite funds; which he consented to do, on having two-thirds of the profits made over to him. A patent was accordingly obtained in 1769, and an engine soon after erected; but the failure of Dr. Roebuck thwarted the project, for a time, and the subject of our memoir returned to his business of a civil engineer. At length, in 1774, a proposal was made to him, to remove to Birmingham, and enter into partnership with the celebrated hardware manufacturer, Mr. Boulton. Dr. Roebuck’s share of the patent was shortly afterwards transferred to Mr. Boulton, and the firm of Boulton and Watt commenced the business of making steam-engines, in the year 1775. From this date, Mr. Watt obtained from parliament an extension of his patent for twenty-five years, in the course of which he added several new improvements to the mechanism of his engine. In particular, he exerted himself, for many years, in contriving the best methods of making the action of the piston communicate a rotatory motion in various circumstances; and, between the years 1781 and 1785, he took out four different patents, for inventions relating to this object.
The invention of Watt was fully appreciated in the scientific world. In 1785, he was elected a fellow of the Royal Society; in 1806, LL.D., by the University of Glasgow; and, in 1808, a member of the French Institute. He died on the 25th of August, 1819, in the eighty-fourth year of his age, leaving behind him a name that will descend to posterity, in connexion with an invention that has already gone far to revolutionize the whole domain of human industry. ‘The trunk of an elephant,’ it has been truly said of this machine, ‘that can pick up a pin, or rend an oak, is as nothing to it. It can engrave a seal, and crush masses of obdurate metal like wax before it; draw out, without breaking, a thread as fine as gossamer; and lift a ship of war, like a bauble, in the air. It can embroider muslin, and forge anchors; cut steel into ribands, and impel loaded vessels against the fury of the winds and the waves.’
JOHN HOWARD.
John Howard, whose name as a philanthropist must be familiar to a number of our readers, was born at Clapton, in the parish of Hackney, in the immediate vicinity of London, in or about the year 1727. His father was an upholsterer and carpet-warehouseman, who had acquired a considerable fortune in trade, and had retired from business to live at Hackney. Being a dissenter, and a man of strong religious principles, he sent his son at an early age to be educated by a schoolmaster named Worsley, who kept an establishment at some distance from London, where the sons of many opulent dissenters, friends of Mr. Howard, were already boarded. The selection appears to have been injudicious; for in after-life Mr. Howard assured an intimate friend, with greater indignation than he used to express on most subjects, ‘that, after a continuance of seven years at this school, he left it not fully taught any one thing.’ From Mr. Worsley’s school he was removed, probably about the age of fourteen, to one of a superior description in London, the master of which, Mr. Eames, was a man of some reputation for learning. His acquisitions at both seminaries seem to have been of the meagre kind then deemed sufficient for a person who was to be engaged in commercial pursuits; and it is the assertion of Mr. Howard’s biographer, Dr. Aikin, founded on personal knowledge, that he ‘was never able to speak or write his native language with grammatical correctness, and that his acquaintance with other languages—the French perhaps excepted—was slight and superficial.’ In this, however, he did not differ perhaps from the generality of persons similarly circumstanced in their youth, and destined, like him, for business.
At the age of fifteen or sixteen Mr. Howard was bound apprentice by his father to Messrs. Newnham and Shipley, extensive wholesale grocers in Watling Street, who received a premium of £700 with him. His father dying, however, shortly afterwards, and the state of his health or his natural tastes indisposing him for the mode of life for which he had been destined, he made arrangements with his masters for the purchase of the remaining term of his apprenticeship, and quitted business. By the will of his father, who is described as a strict methodical man, of somewhat penurious disposition, he was not to come into possession of the property till he had attained his twenty-fourth year. On attaining that age, he was to be entitled to the sum of £7000 in money, together with all his father’s landed and moveable property: his only sister receiving, as her share, £8000 in money, with certain additions of jewels, etc., which had belonged to her mother. Although nominally under the charge of guardians, Mr. Howard was allowed a considerable share in the management of his own property. He had his house at Clapton, which his father’s parsimonious habits had suffered to fall into decay, repaired or rebuilt, intending to make it his general place of residence. Connected with the repairing of this house an anecdote is told of Mr. Howard, which will appear characteristic. He used to go every day to superintend the progress of the workmen; and an old man who had been gardener to his father, and who continued about the house until it was let some time afterwards, used to tell, as an instance of Mr. Howard’s goodness of disposition when young, that every day during the repairs he would be in the street, close by the garden wall, just as the baker’s cart was passing, when he would regularly buy a loaf and throw it over the wall, saying to the gardener as he came in, ‘Harry, go and look among the cabbages; you will find something for yourself and family.’
After passing his twentieth year, Mr. Howard, being of delicate health, quitted his native country, and made a tour through France and Italy, which lasted a year or two; but of the particulars of which we have no account. On his return to England, probably about the year 1750, he took lodgings in Stoke Newington, living as a gentleman of independent property and quiet, retired habits, and much respected by a small circle of acquaintances, chiefly dissenters. The state of his health, however, was such as to require constant care. His medical attendants, thinking him liable to consumption, recommended to him a very rigorous regimen in diet, which ‘laid the foundation,’ says one of his biographers, ‘of that extraordinary abstemiousness and indifference to the gratifications of the palate which ever after so much distinguished him.’ This condition of his health obliged him also to have recourse to frequent changes of air and scene. Newington, however, was his usual place of residence. Here, having experienced much kindness and attention during a very severe attack of illness from his landlady, Mrs. Sarah Loidoire, an elderly widow of small property, he resolved to marry her; and although she remonstrated with him upon the impropriety of the step, considering their great disparity of ages—he being in his twenty-fifth, and she in her fifty-second year—the marriage was concluded in 1752. Nothing but the supposition that he was actuated by gratitude, can account for this singular step in Mr. Howard’s life. The lady, it appears, was not only twice as old as himself, but also very sickly; and that no reasons of interest can have influenced him, is evident, as well from the fact that she was poor in comparison with himself, as from the circumstance of his immediately making over the whole of her little property to her sister. Mr. Howard seems to have lived very happily with his wife till her death shortly afterwards, in November, 1755.