The investigation by measurements has since been largely adopted. In 1787, joint commissions were issued by England and France to connect the Greenwich and Parisian observations. Arcs of the meridian have since been measured across the whole breadth of France and Spain, and also near the Arctic circle, and in the Indian peninsula.
In navigation, the grand point for the sailor is to ascertain his latitude and longitude; in other words, to know where he is. The discovery of the latitude is easily effected by the quadrant, but the longitude is the difficulty. Any means which ascertained the hour at Greenwich, at the instant of making a celestial observation in any other part, would answer the difficulty; for the difference in quarters of an hour would give the difference of the degrees. But clocks could not be used on shipboard, and the best watches failed to keep the time. In the reign of Anne, Parliament offered a reward of L. 5000, perhaps not far from the value of twice the sum in the present day, for a watch within a certain degree of accuracy. Harrison, a watchmaker, sent in a watch which came within the limits, losing but two minutes in a voyage to the West Indies; yet even this was an error of thirty miles.
But, though chronometers have since been considerably improved, there are difficulties in their preservation in good order which have made it expedient to apply to other means; and the lunar tables of Mayer of Gottingen, formed in 1755, and subsequently improved by Dr Maskelyne and others, have brought the error within seven miles and a half.
Improvements of a very important order have also taken place in the mariner's compass; the variation of the needle has been reduced to rules, and some anomalies arising from the metallic attraction of the ship itself, have been corrected by Professor Barlow's experiments. The use of the marine barometer and thermometer have also largely assisted to give notice of tempests; and some ingenious theories have been lately formed, which, promising to give a knowledge of the origin and nature of tempests, are obviously not unlikely to assist the navigator in stemming their violence, or escaping them altogether.
The construction of ships for both the merchant and the public service has undergone striking improvements within this century. Round sterns, for the defence of a vessel engaged with several opponents at once; compartments in the hold, for security against leaks; iron tanks for water, containing twice the quantity, and keeping it free from the impurities of casks; a better general stowage; provisions prepared so as to remain almost fresh during an East Indian voyage; every means of preserving health, suggested by science, and succeeding to the most remarkable degree; a more intelligent system of shipbuilding, and a constant series of experiments on the shape, stowage, and sailing of ships, are among the beneficial changes of later times. But the one great change—steam—will probably swallow up all the rest, and form a new era in shipbuilding, in navigation, in the power and nature of a navy, and in the comfort, safety, and protection of the crews in actual engagement. The use of steam is still so palpably in its infancy, yet that infancy is so gigantic, that it is equally difficult to say what it may yet become, and to limit its progress. It will have the one obvious advantage to mankind in general, of making the question of war turn more than ever on the financial and mechanical resources of a people; and thus increasing the necessity for commercial opulence and intellectual exertion. It may expose nations more to each other's attacks; but it will render hostility more dreaded, because more dangerous. On the whole, like the use of gunpowder, which made a Tartar war impossible, and which rapidly tended to civilize Europe, steam appears to be intended as a further step in the same high process, in which force is to be put down by intelligence, and success, even in war, is to depend on the industry of peace; thus, in fact, providing a perpetual restriction on the belligerent propensities of nations, and urging the uncivilized, by necessity, to own the superiority, and follow the example of the civilized, by knowledge, habit, and principle.
It is not to be forgotten, even in this general and brief view of the values of the British fleet, that it has, within these few years, assumed a new character as an instrument of war. The Syrian campaign, the shortest, and, beyond all comparison, the most brilliant on record, if we are to estimate military distinction, not only by the gallantry of the conflict, but by the results of the victory—this campaign, which at once finished the war in Syria, gave peace to Turkey, reduced Egypt to obedience, rescued the sultan from Russian influence, and Egypt from French; or rather rescued all Europe from the collision of England, France, and Russia; and even, by the evidence of our naval capabilities, taught American faction the wisdom of avoiding hostilities—this grand operation was effected by a small portion of the British navy, well commanded, directed to the right point, and acting with national energy. The three hours' cannonade of Acre, the most effective achievement in the annals of war, exhibited a new use of a ship's broadside; for, though ships' guns had often battered forts before, it was the first instance of a fleet employed in attack, and fully overpowering all opposition. The attack on Algiers was the only exploit of a similar kind; but its success was limited, and the result was so far disastrous, that it at once fixed the eye of France on the invasion of Algiers, and disabled and disheartened the native government from vigorous resistance. The victory of the fleet at Acre will also have the effect of changing the whole system of defence in fortresses and cities exposed to the sea.
But a still further advance in the employment of fleets as an instrument of hostilities, has since occurred in the Chinese war—their simultaneous operation with troops. In former assaults of fortresses, the troops and ships attacked the same line of defence, and the consequence was the waste of force. From the moment when the troops approached the land, the fire of the ships necessarily ceased, and the fleet then remained spectators of the assault. But in this war, while the troops attacked on the land side, the fleet ran up to the sea batteries, and both attacks went on together—of course dividing the attention of the enemy, thus having a double chance of success, and employing both arms of the service in full energy. This masterly combination the Duke of Wellington, the highest military authority in Europe, pronounced to be a new principle in war; and even this is, perhaps, only the beginning of a system of combination which will lead to new victories, if war should ever unhappily return.
We now revert to the history of a naval hero.
John Jervis, the second son of Swynfen Jervis, Esq., was born on the 20th of January 1735. He was descended, on both the paternal and maternal side, from families which had figured in the olden times of England. The family of Jervis possessed estates in Staffordshire as far back as the reign of Edward III. The family of Swynfen was also long established in Worcestershire. John Swynfen was a public character during the troubled times of Charles I. and Cromwell, and until a late period in the reign of Charles II. He had been originally a strong Parliamentarian; but, thinking that the party went too far, he was turned out of parliament for tardiness by the Protector. But his original politics adhered to him still; for, even after the restoration, he was joined with Hampden, the grandson of the celebrated patriot, in drawing up the Bill of Exclusion. Among his ancestors by the mother's side was Sir John Turton, a judge in the Court of King's Bench, married to a daughter of the brave Colonel Samuel Moore, who made the memorable defence of Hopton Castle in the Civil War.
But no man less regarded ancestry than the subject of the present pages, who, in writing with reference to his pedigree, observed, in his usual frank and straightforward language—"They were all highly respectable; but, et genus et proavos, nearly all the Latin I now recollect, always struck my ear as the sound maxim for officers and statesmen."