The best experience affirms the policy of giving to our cruisers as large steampower as is consistent with a due development of all other warlike qualities; for what would avail the superior armament of a ship, if the option of fighting or flying remain with her adversary, which must be the case when the latter commands higher speed? The introduction of improved ordnance, throwing heavy shells with great precision at long ranges, gives increased importance to celerity; for in any future fleet-fight, victory should belong to that flag having at command a steam-squadron of superior speed, which may thereby be concentrated upon any point without having been long under fire.
May not the command of a maximum speed of thirteen knots be obtained from the machinery now employed for a maximum speed of ten knots? It evidently may, and with great economy, too, by the simple introduction of artificial draft, and the use of steam of higher pressure, when requiring the highest speed. At present, in our men-of-war, the boilers are proportioned for natural draft, burning about twelve pounds of coal per square foot of grate per hour, and for a steam-pressure of fifteen pounds per square inch. If, then, the boilers be proportioned to burn at the maximum, with blowers, say twenty-two pounds of coal to the square foot of grate, and to generate steam of forty pounds to the square inch, we shall double the power developed by the machinery, and consequently derive from it the same speed that could be attained without blowers from double the machinery; while the natural draft and the usual pressure of fifteen pounds would give sufficient speed for ordinary service. The inconvenience of the higher pressure with blowers could well be endured for the short and occasional periods during which they would be required.
To create a perfect screw-frigate, a ship with sail-power complete, and efficient for any service that may be required, the endeavor should be made—by getting rid of every dispensable article of weight or bulk, and without reducing supplies below three months' provisions and six weeks' water—to find space and displacement for an engine of sufficient force to drive her thirteen knots an hour, together with at least ten days' full consumption of fuel; and this, it is believed, might be successfully accomplished in ships of the dimensions of the Wabash, beginning with a judicious reduction of spare spars, spare sails, and spare gear, and by the addition of blowers to their present machinery: a subject which should immediately receive the earnest consideration of a commission of the most intelligent officers.
Having fixed upon the proportions of hull and spars, the form of propeller, and the plan of engine, a cautious discrimination should be exercised in multiplying the types of either. Besides economy, many other advantages would flow from a judicious regard to similarity in build; as it would permit us to relieve our ships of many of the spare spars with which they are incumbered, and we should probably not again hear of suspending the operations of a frigate thousands of miles away, until a crank or rod could be sent to her; because, when ships of the same class are cruising together, by a careful distribution of spare spars and machinery among them, it is hardly probable that damage would be sustained, or loss of spars or "break down" occur, which might not be remedied by the resources of the squadron.
On the other hand, this system not be carried to a Chinese extreme, lest we follow too long a false direction,—thus losing the advantage of improvements constantly being made. For such is the change in all things pertaining to maritime war, that neither model of hull, plan of engine, nor mould of ordnance is best, unless of the latest creation. True progress will be most judiciously sought in not departing too suddenly and widely from the established order.
WHITE MICE.
A great many circumstances led me to decide on leaving the convenient boarding-house of Mrs. Silvernail: a house correctly described as containing several "modern improvements": improperly, as being "in the immediate vicinity of all the places of public amusement." For, as the Central Park of New York is a place of public amusement, so likewise is Barnum's Museum; and these two places being at a distance of about five miles from each other, how could any one house be in the immediate vicinity of both? But it was not upon this incompatibility that any of my objections were founded.
If I have a prejudice, it is against being talked at instead of to. Now Mrs. Silvernail, who, like the katydid of the poplar-tree, if small, was shrill, had a way of conveying instructions to her boarders by means of parables ostensibly directed at Catharine, the tall Irish serving-maid, but in reality meant for the ear of the obnoxious boarder who had lately transgressed some important statute of the house, made and provided to meet a case or cases.
A landing-place on the stairs was usually the platform selected for the delivery of a monologue, in which Catharine was always assumed to be the person addressed; although I have known instances in which that "excellent wench" was, at the time of being so conferred with, in the grocery at the corner, about half a block distant, as I could see from the window where I sat and viewed her protracting her doorway dalliance with Jeremiah Tomaters, the grocer's efficient young man.
"Catharine," my landlady would say in a loudish whisper, close by a malefactor's chamber-door, and probably when Catharine was yet far down the street,—"Catharine, who let the water in the bathroom run over just now? If the slippers he left behind him a'n't Mr. Jennings's, I declare! Boarders must be warned an' watched, elseways we shall hev all in the house afloat, 'cepting the stoves an' flat-irons, by-'n'-by. Somebody at Mrs. Moyler's acted so, and the house was like a roarin' sea, with the baby adrift in his little cradle, and the roaches a-swimmin' round. Oh, dear!"