There are, of course, limitations to the range and efficiency of the new Navy, owing to the necessity of replenishing supplies of fuel,—a most difficult and extremely costly process in many parts of the world. Such modern cruisers as the Columbia carry, to be sure, an immense quantity of coal—and there are others, such as the New York and the Olympia, which not only possess great speed, but also carry more fuel than most vessels of their class. They need to do so, for our coaling stations abroad are very few.
Some nations, especially the Italians, who have a very formidable navy, and one far above their means, have experimented extensively with petroleum, in its crude form, as a fuel, and, it is stated, with a certain degree of success. But this for the most part is a consideration for those nations which have no mines of coal under their own control, and we must remember that, in time of war, the supply of petroleum might be cut off even more effectually than that of coal. But to return:—The use of steel for the hulls of vessels, the armor, protective decks, and other purposes of construction, has greatly multiplied the strength of those parts, while it has made the whole much lighter, so that the same expenditure of steam will carry the structure much farther and much faster. We have already stated that nickel-steel is able to resist very effectually the most modern projectiles from the latest guns. When, a few years ago, such qualities were claimed for it by us, the English experts in such matters rather sneered at the idea, and said that more extensive trials should be had before they could believe in its value. The experiments were so triumphantly successful that not only was all opposition withdrawn, but the object then was to get hold of the process as soon as possible. Nickel-steel is what may be called a great fact, and subsequent discoveries in metallurgy will never destroy its value for certain purposes.
The Harvey process was another thing upon which the Europeans looked with great doubt until the perfect success of armor made in that way, in trials against very powerful guns at short range, opened their eyes. This process consists in the hardening of the outside surface of a thick plate to a certain depth, leaving the back part of the plate with the toughness of the untempered metal, so that the shot which strikes it has to encounter obstacles of two kinds—the hardness which breaks it up, and the toughness which prevents serious entry.
As it is, the contest between gun and armor is continually going on. When armor is found which resists very powerful guns and the newest explosive, a more powerful gun is built, which makes another increase in armor necessary. At the present time there is no predicting how long this contest may go on, for the improvements in guns and armor keep equal pace.
New explosives have the same story to tell. They vary in name and in effect, but most of them are based upon the same chemical principles. Some keep better than others, and are thus best suited for preservation in the magazines of ships, where, especially in case of faulty construction, or of prolonged stay in hot climates, the delicate chemical combination of which the modern explosive consists is very much more likely to undergo change than the old-fashioned “black power”—especially when the latter was well made.
There is, therefore, constant experimenting, and constant change in opinion in regard to explosives.
Torpedoes are another source of trouble to experts in naval warfare; the fact being that they have never been sufficiently tried in actual service to settle completely their respective values. Of the mobile torpedoes one was used with destructive effect during the Chilean War, and some spar-torpedoes were effective during our Civil War, and during the Russo-Turkish War, where mobile torpedoes were also used, but it is still a matter of doubt with many naval officers of experience as to what part the mobile torpedo is to play in any future contest.
As regards torpedo-boats, which launch their torpedoes one at a time, and directly in the line in which the boat is pointed, the opinion is that they will prove very useful for coast and harbor defence, but unfit for severe weather or heavy seas, very wearing upon their crews, liable to accidents of a serious nature, and only able to carry fuel for short runs. Many of the accidents to this class of boats have involved loss of life, and, while the French and English have increased their number, other nations, such as the Italians and the Germans, have rather decided against their increase. At one time within recent years the Italians encouraged torpedo-boats, and in Germany one of the most successful of all builders is the Shichau Company, which has built boats for all the world but France, America, and England.
The “torpedo catchers,” so called, are quite different affairs from the ordinary torpedo-boat. They are quite large and swift vessels compared with the ordinary torpedo-boat, and are intended as “counter-miners,” and, by speed, and ability to keep the sea better, to prevent the swarm of ordinary torpedo-boats from doing serious damage. Sufficient experience has not been gained in the experimental trials to know just how much these vessels will do in case of actual warfare, but much is expected of them. Very lately a well-known English builder of torpedo boats and other small craft has launched a boat which is said to have made twenty-seven knots, or about the average speed of a passenger train on a good railroad.
Submarine torpedo-boats have received much attention of late years, when improvements and inventions, especially in electricity, have rendered them comparatively easy to handle. In France and Spain, especially, very successful boats have been experimented with. In our own country, where the idea originated early in the century, there have been several submarine boats built which have remained for a long time under water, being directed by the crew in any wished-for course. Not long ago Congress appropriated a large sum for building a sub-marine torpedo boat; but experiments conducted to show whether an explosion effected by such means would not be also fatal to the boat herself, led to hesitation on the part of the authorities as to expending the money in that way, and to a proposal to build surface torpedo boats instead.