CHAPTER XX.
Influences of knowledge in the direction of labour and capital—Astronomy—Chronometer—Mariner's compass—Scientific travellers—New materials of manufactures—India-rubber—Gutta-percha—Palm-oil—Geology—Inventions that diminish risk—Science raising up new employments—Electricity—Galvanism—Sun-light—Mental labourers—Enlightened public sentiment.
Lord Bacon, the great master of practical wisdom, has said that "the effort to extend the dominion of man over nature is the most healthy and most noble of all ambitions." "The empire of man," he adds, "over material things has for its only foundation the sciences and the arts."[24] A great deal of the knowledge which constitutes this dominion has been the property of society, handed down from the earliest ages. No one can tell, for instance, how the art of leavening bread was introduced amongst mankind; and yet this process, now so familiar to all, contributes as much, if not more, than any other art to the wholesome and agreeable preparation of our food. Leavening bread is a branch of chemistry, and, like that process, many other processes of chemistry have been the common property of civilized man from time immemorial. Within a few centuries, however, science has applied its discoveries to the perfection of the arts; and in proportion as capital has been at hand to encourage science, has the progress of the application been certain and rapid. The old Alchemists, or hunters after the philosopher's stone, sought to create capital by their discoveries. They could not make gold, but they discovered certain principles which have done as much for the creation of utility in a few hundred years as the rude manual labour of all mankind during the same period. Let it not be supposed that we wish to depreciate manual labour. We only wish to show that labour is incomparably more prolific when directed by science. Mahomet Bey, the ruler of Tunis, was dethroned by his subjects. He had the reputation of possessing the philosopher's stone, or the art of turning common metals into gold. The Dey of Algiers restored him to his throne upon condition that the secret should be communicated to him. Mahomet, with great pomp and solemnity, sent the Dey of Algiers a plough. This was so far well. He intimated that to compel production by labour is to make a nation rich. But had he been able to transmit some of the science which now controls and guides the operations of the plough—the chemical knowledge which teaches the proper application of manures to soils—the rotation of crops introduced by the turnip-husbandry, which renders it unnecessary that the ground should ever be idle,—he would have gone farther towards communicating the real philosopher's stone.
The indirect influence, too, of a general advance in knowledge upon the particular advance of any branch of labour, is undeniable;—for the inquiring spirit of an age spreads itself on all sides, and improvement is carried into the most obscure recesses, the darkest chinks and corners of a nation. It has been wisely and beautifully said, "We cannot reasonably expect that a piece of woollen cloth will be wrought to perfection in a nation which is ignorant of astronomy, or where ethics are neglected."[25] The positive influence of science in the direction of labour is chiefly exhibited in the operations of mechanics and chemistry applied to the arts, in the shape of machines for saving materials and labour, and of processes for attaining the same economy. We have described the effects of some of these manifold inventions in the improvement of the condition both of producers and consumers. But there are many particulars in which knowledge has laboured, and is still labouring, for the advance of the physical and moral condition of us all, which may have escaped attention; because these labours operate remotely and indirectly, though not without the highest ultimate certainty and efficiency, in aiding the great business of production. These are the influences of science upon labour, not so direct as the mechanical skill which has contrived the steam-engine, or so indirect as the operation of ethics upon the manufacture of a piece of woollen cloth; but which confer a certain and in some instances enormous benefit upon production, by the operation of causes which, upon a superficial view, appear to be only matters of laborious but unprofitable speculation. If we succeed in pointing out the extent and importance of those aids which production derives from the labours of men, who have not been ordinarily classed amongst "working men," but who have been truly the hardest and most profitable workers which society has ever possessed, we shall show what an intimate union subsists amongst those classes of society who appear the most separated, and that these men really labour with all others most effectually in the advancement of the great interests of mankind.
Harrison.
When Hume thought that a nation would be behind in the manufacture of cloth that had not studied astronomy, he perhaps did not mean to go the length of saying, that the study of astronomy has a real influence in making cloth cheaper, in lessening the cost of production, and in therefore increasing the number of consumers. But look at the direct influence of astronomy upon navigation. A seaman, by the guidance of principles laid down by the great minds that have directed their mathematical powers to the study of astronomy—such minds as those of Newton and La Place—measures the moon's apparent distance from a particular star. He turns to a page in the 'Nautical Almanac,' and, by a calculation directed principally by this table, can determine whereabout he is upon the broad ocean, although he may not have seen land for three months. Sir John Herschel, who unites to the greatest scientific reputation the rare desire to make the vast possessions of the world of science accessible to all, has given, in his 'Discourse on the Study of Natural Philosophy,' an instance of the accuracy of such lunar observations, in an account of a voyage of eight thousand miles, by Captain Basil Hall, who, without a single landmark during eighty-nine days, ran his ship into the harbour of Rio as accurately, and with as little deviation, as a coachman drives his stage into an inn-yard. But navigation not only depends upon lunar distances, but upon an instrument which shall keep perfect time under every change of temperature produced by variety of climate. That instrument is a chronometer. Every one who possesses a watch, however good, must have experienced the effects of heat or cold upon its accuracy, in making it go faster or slower—perhaps a minute in a week. Now if there were not an instrument that would measure time so exactly that between London and New York not a minute, or large fraction of a minute, would be lost or gained, the voyage would be one of difficulty and uncertainty. A Yorkshire joiner, John Harrison, at the beginning of the last century, found out the principle of the chronometer, which consists in the union in the balance-spring of two metals, one which contracts under increased temperature, and one which expands; and on the contrary under diminished temperature. Harrison worked for fifty years at his discovery; and he obtained a parliamentary reward of 20,000l.
