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CAN'T YOU SEE A TRANSATLANTIC AIR-LINER STARTING ON ITS VOYAGE SIMPLY BY FLOATING OFF WITH THE WIND OR BY BACKING OFF WITH REVERSED PROPELLERS?

will be covered by single roofs, each perhaps century, when flying-machines are still novela square mile in area and more.

Equally simple of solution is the problem of housing the thousands of flying-machines that will throng the air. Some of the manyfloored automobile garages of the present city could be employed for the storing of flying-machines. If a military machine of our own day can be taken apart and packed in a motor van in less than ten minutes, no remarkable prophetic gift is required to foresee a machine which, when collapsed, will occupy less room than a seven-passenger touring car of 1913, and which can be lifted to the roof by an elevator of the type now to be found in every city garage.

FLORIDA BECOMES A WINTER CONEY ISLAND FOR THE CITY OF NEW YORK

The railway created the modern suburb— made it a residential part of the city on the outskirts of which it is built. Similarly, the flying-machine will bring the city and country measurably nearer each other. Let us not forget that even in our own time, with machines that will seem childishly crude a century hence, speeds of more than one hundred miles an hour have been attained. It is not too daring to predict that farm-houses will become suburban cottages; that the scattered population of rural districts will become direct customers of the city merchant; that the lecturer, the virtuoso, the lawyer, the banker, will all be able to increase their clientele. Because of its great speed and its radius of action, the future aeroplane will be able to cover the distance between New York and Chicago in a few hours. It is not inconceivable that a man may breakfast in New York or London and dine the same evening in St. Louis or Rome. The inhabitants of towns far inland will spend their summer holidays at the seashore. Florida will become a kind of winter Coney Island for New York.

When the age of the aeroplane and the air-ship really comes, new political problems will arise. What, for example, will become of our present tariff laws? Can we prevent smuggling in a machine that travels in three dimensions? When Selmet flew from London to Paris, some months ago, he entered the French capital above the clouds and saw only a sea of mist with no sign of a spire or roof. When he landed at Issy-les-Moulineaux, on the outskirts of the city, he had to explain at Length who he was. Even in this twentieth

ties, he was mistaken for the pilot of an ordinary school aeroplane returning from a short outing. En route he had made two landings. No one had noticed them. Nor was his course through the air more narrowly observed, simply because he was hidden by clouds. When the atmosphere becomes in truth a highway, and the whirring of an aeroplane's propellers as common as the chugging of an automobile motor, will it be possible to prevent the smuggling of jewels, laces, and silks, and those smaller, easily carried articles of luxury, now subject to an import tax by many countries? Or will it be possible, by policing the atmosphere above the border line, to prevent violation of the customs laws?

POLICING THE AIR

Policing of some kind will surely be necessary above European fortifications, now jealously guarded from the eyes of the military spy. It is not likely that the long line of fortresses on either side of the boundary that separates France from Germany may be sailed over without calling forth a warning signal from a sentinel wheeling with clock-like regularity over that region, which a hostile eye may not study.

Over cities, too, the aerial sentry or policeman will be found. A thousand aeroplanes flying to the opera must be kept in line and each allowed to alight upon the roof of the auditorium in its proper turn. In giant circles you can imagine them soaring in a huge flock. Signals will be made by a policeman in a swift monoplane (on his arm he wears the orange wings of the aerial traffic squad), and one by one the machines of the boxholders will separate from the great spinning cluster and glide down. A liveried attendant will assist the passengers as they clamber out.

So every hotel, office building, and drygoods store must see to it that its roof is utilized in an orderly way by the flocks of aerial taxicabs and private machines. If a faulty motor compels an immediate descent, an emergency signal will be given; by day, a rocket that leaves a trail of black smoke; by night, a flash of light conspicuous in color.

How can the man in the air pick out the roof for which he is bound? A dozen ways of disentangling roof from roof immediately suggest themselves. Colors and numbers

will probably be employed in some distinctive way, and perhaps painted geo

metrical designs (squares, circles, and triangles) will serve to distinguish public aerial garages, hotels, and theaters from one another. The elevator platforms on which machines will be lifted will surely be painted a vivid color, contrasting with that of the roof itself, and an attendant will be constantly on duty to signal to those in the air when they may descend and use the elevator.

Quick to awaken to the possibilities of the roof will be the advertiser. He will plaster it, whenever he can do so without misleading the airman, with pictures and legends, proclaiming the virtues of his pills and soaps, his breakfast foods and his safety razors. The signs which now flank every railway, and which inform the passenger that the particular marsh at which he is languidly gazing is "ten miles from Bloomer's Emporium," will find their counterparts in huge advertisements that lie flat on their backs and stare up at the population of the atmosphere. In their horizontal position they will be as useful as the vertical sign erected for the benefit of the railway traveler, for they, too, will indicate the proximity of a town, and serve as guideposts for the aerial navigator.

GUIDING THE MAN WHO SAILS THE

ATMOSPHERE

Indeed, the guiding of the airman will become so highly important that governments will set about the task of mapping the ocean of air as carefully as ever the waters about a rocky coast have been charted. With the aid of a compass and an official map (a band, perhaps a hundred feet long, which can be unrolled from one cylinder upon another beneath a sheet of transparent celluloid, and which will clearly indicate the position of church spires, telegraph and telephone wires, forests, railways, and tall factory chimneys) the aerial navigator will pick his way through the blue.

But suppose that it is night, or that a dense fog veils the terrain below? Is he helpless? Not when a really efficient set of wireless instruments has been invented for the use of aviators. He will clap his wireless receiver to his head and listen for the guiding signals of the nearest government transmitter of aerial waves. Every little village will have its wireless station, electrically controlled from a central weather bureau or geographical office hundreds of miles away. Only in the dron

ing central station will operators be found, for automatic instruments will send out the signals from the smaller stations, instruments that are mechanically or electrically controlled, just as United States Naval Observatory time is now transmitted from a master clock to hundreds of timepieces.

All this applies to the air-ship as well as to the flying-machine. For, although the giant Zeppelins of our time were destroyed with disheartening regularity, it must not be supposed that the aeroplane will completely displace the dirigible. Count von Zeppelin's leviathans have come to grief, not in the air, but when anchored near the ground in a gale. A stranded schooner, battered by huge waves against a reef, is in a predicament only a shade worse than that of a Zeppelin anchored in a hurricane. The Zeppelin is not simply hammered and twisted, but is also exposed to the dangers of static electricity generated by friction. A single electric spark has been known to ignite the highly explosive buoyant gas with which the envelope compartments of a Zeppelin are filled, and to reduce a vessel costing one hundred and fifty thousand dollars to a chaos of twisted metal.

TETHERING THE GIANT DIRIGIBLE OF THE FUTURE

High

To guard against such accidents, steel towers have been latterly proposed (a small one has even been erected in England), from the tops of which the ships may swing with the wind like so many weather-vanes. above the roofs of the future city, higher even than the tallest office buildings of the present, these towers are destined to loomEiffel towers padded at the top to prevent injury to the ships in possible collisions. They will not be erected haphazard, with no regard to their location in the city, but, lest they interfere with aerial traffic, they will fringe the city like the steamship wharves of the present.

In your mind's eye can't you see the elevators conveying passengers upward through the maze of steel girders to the great ships tethered above, casting enormously long shadows on the roofs and streets below? Can't you see a transatlantic air-liner starting on its voyage simply by floating off with the wind or by backing off with reversed propellers? Can't you see another approaching a tower very closely against the wind? Can't you see the first thin rope cast from the ship uncoiling like a long serpent? Can't you

see the hawser tied to that rope hauled in? Can't you hear the gong that tells the engineer to reverse his propellers, so that the ship may be stopped almost instantly and made fast?

Surely the mooring of a future air-liner will be fully as impressive, fully as spectacular, fully as ceremonious as the mooring of a Lusitania. It will even be exciting in a gale; for, if the wind is blowing with a velocity greater than the maximum speed of the ship, it is not difficult to imagine the captain approaching the tower stern first on the windward side, slowly drifting back with the gale, against which he is running with the propellers revolving at full speed.

As they disembark the passengers will all pass up into the tapering nose of the envelope, out through a door, and step upon a platform which swings with the ship in the wind.

If

All the experience of the present justifies the assumption that both aeroplanes and airships will cleave the air. How big will they be? To the size of the air-ship there is no theoretical limit. Indeed, the bigger it is the more economically can it be operated. there were any good reason for doing so, and if the passenger demands of the present were great enough, Count von Zeppelin could no doubt design a dirigible longer than any transatlantic liner, and drive it from Sicily to Liverpool and back on a schedule that could be maintained with fair regularity, even with the imperfect meteorological data at present supplied by weather bureaus. But the aeroplane, on the other hand, is not capable of unlimited magnification. It is not likely that it will ever carry more than five or seven passengers. High-speed monoplanes will carry even less. Compared with them biplanes and triplanes-both good weight lifters and carriers-will seem as lumberingly slow as a sightseeing automobile.

AIRCRAFT IN THE WAR OF THE FUTURE

Long before these changes will be effected, aircraft will so far have changed our methods of fighting that an entirely new science of warfare will have been created. In less than half a century combats will be fought in three dimensions instead of in two. The experience gained in the great European military maneuvers and in the Tripolitan campaign clearly indicates that.

Above all, a new system of tactics must be invented. Captain Bellenger, of the French

army, an officer who has had much practical experience, maintains that an enemy can no longer conceal his movements. He will be compelled to move. Forced marches, in Bellenger's opinion, will become the ruledense masses of troops hurrying on almost blindly in order to escape the attack that must inevitably follow detection by a watchful eye in the air. In forced marches Bellenger sees the salvation of many a future army corps.

All this assumes inactivity on the part of the aircraft. Have we any reason to suppose that a brigade can escape destruction merely by a forced march? Suppose that a great air-ship, plunging through the air at expresstrain speed at a low elevation above the long, writhing, sweating, toiling serpent of men, necessarily marching in close formationsuppose that an air-ship should drop two hundred bombs, one bomb every hundred yards. Who can describe the frightful panic that would ensue? The attack has come so swiftly that there has been no time to prepare for it. All eyes will be directed toward the vessel. No one will notice the bombs until their awful explosions reveal the true purpose of the aerial visitation. Even if the roar of rapidly succeeding explosions apprises the officers further ahead of an impending attack, and even if the morale of the men is such that they can be brought to fire, there will hardly be time enough for more than one shot per man. Riddled though it may be with a thousand bullets, a rigid Zeppelin can still keep afloat. Indeed, there may be difficulty in keeping it down because of the bombweight that has been discarded. Each bullet hole will have a diameter less than that of an ordinary gas-burner. With no pressure, the twenty thousand cubic meters of gas in a Zeppelin will escape so slowly that there will be ample time, if not to reach headquarters, at least to land in a safe zone near a railway, so that fresh gas and new ballonets can be hurried to it.

Aeroplanes, too, will be used in the war of the future. Perhaps, as some German officers have suggested, they may be employed as auxiliaries to the larger air-ship, which, because of its greater radius of action, may assume the task of locating the general position of a huge hostile army, leaving to the swift aeroplane the task of studying the position and strength of individual batteries and brigades. Perhaps, too, it may be possible to conceal aeroplanes behind a clump of

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WHEN THE UNSTEADY MUZZLE-SIGHT RESTS FOR AN INSTANT UPON IT THE TRIGGER IS PULLE
FOR AN INSTANT THE BIPLANE SEEMS TO HOVER LIKE A
THE EFFECT IS MAGICAL.
THEN IT PLUNGES DOWN, DOWN, WITH VERTIGINOUS SPEED
WOUNDED BIRD.

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