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Across the Zodiac. Percy Greg
Читать онлайн.Название Across the Zodiac
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isbn 4057664631077
Автор произведения Percy Greg
Жанр Языкознание
Издательство Bookwire
And now a surprise, the first I had encountered, awaited me. I registered the gravity as shown by the barycrite; and, extinguishing the electric lamp, measured repeatedly the semi-diameter of the Earth and of the halo around her upon the discometer, the inner edge of the latter affording the measurement of the black disc, which of itself, of course, cast no reflection. I saw at once that there was a signal difference in the two indications, and proceeded carefully to revise the earth-measurements. On the average of thirteen measures the halo was about 87", or nearly 1–½' in breadth, the disc, allowing for the twilight round its edge or limb, about 2° 50'. If the refracting atmosphere were some 65 miles in depth, these proportions were correct. Relighting the lamp, I worked out severally on paper the results indicated by the two instruments. The discometer gave a distance, roughly speaking, of 40 terrestrial radii, or 160,000 miles. The barycrite should have shown a gravity, due to the Earth's attraction, not 40 but 1600 times less than that prevailing on the Earth's surface; or, to put it in a less accurate form, a weight of 100 lbs. should have weighed an ounce. It did weigh two ounces, the gravity being not one 1600th but one 800th of terrestrial gravity, or just double what, I expected. I puzzled myself over this matter longer, probably, than the intelligent reader will do: the explanation being obvious, like that of many puzzles that bewilder our minds intensely, only to humiliate us proportionately when the solution is found—a solution as simple as that of Columbus's egg-riddle. At length, finding that the lunar angle—the apparent position of the Moon—confirmed the reading of the discometer, giving the same apogaic distance or elevation, I supposed that the barycrite must be out of order or subject to some unsuspected law of which future observations might afford evidence and explanation, and turned to other subjects of interest.
Looking through the upper window on the left, I was struck by the rapid enlargement of a star which, when I first noticed it, might be of the third magnitude, but which in less than a minute attained the first, and in a minute more was as large as the planet Jupiter when seen with a magnifying power of one hundred diameters.
Its disc, however, had no continuous outline; and as it approached I perceived that it was an irregular mass of whose size I could form not even a conjectural estimate, since its distance must be absolutely uncertain. Its brilliancy grew fainter in proportion to the enlargement as it approached, proving that its light was reflected; and as it passed me, apparently in the direction of the earth, I had a sufficiently distinct view of it to know that it was a mainly metallic mass, certainly of some size, perhaps four, perhaps twenty feet in diameter, and apparently composed chiefly of iron; showing a more or less blistered surface, but with angles sharper and faces more regularly defined than most of those which have been found upon the earth's surface—as if the shape of the latter might be due in part to the conflagration they undergo in passing at such tremendous speed through the atmosphere, or, in an opposite sense, to the fractures caused by the shock of their falling. Though I made no attempt to count the innumerable stars in the midst of which I appeared to float, I was convinced that their number was infinitely greater than that visible to the naked eye on the brightest night. I remembered how greatly the inexperienced eye exaggerates the number of stars visible from the Earth, since poets, and even olden observers, liken their number to that of the sands on the seashore; whereas the patient work of map and catalogue makers has shown that there are but a few thousands visible in the whole heavens to the keenest unaided sight. I suppose that I saw a hundred times that number. In one word, the sphere of darkness in which I floated seemed to be filled with points of light, while the absolute blackness that surrounded them, the absence of the slightest radiation, or illumination of space at large, was strange beyond expression to an eye accustomed to that diffusion of light which is produced by the atmosphere. I may mention here that the recognition of the constellations was at first exceedingly difficult. On Earth we see so few stars in any given portion of the heavens, that one recognises without an effort the figure marked out by a small number of the brightest amongst them; while in my position the multitude was so great that only patient and repeated effort enabled me to separate from the rest those peculiarly brilliant luminaries by which we are accustomed to define such constellations as Orion or the Bear, to say nothing of those minor or more arbitrarily drawn figures which contain few stars of the second magnitude. The eye had no instinctive sense of distance; any star might have been within a stone's throw. I need hardly observe that, while on one hand the motion of the vessel was absolutely imperceptible, there was, on the other, no change of position among the stars which could enable me to verify the fact that I was moving, much less suggest it to the senses. The direction of every recognisable star was the same as on Earth, as it appears the same from the two extremities of the Earth's orbit, 19 millions of miles apart. Looking from any one window, I could see no greater space of the heavens than in looking through a similar aperture on Earth. What was novel and interesting in my stellar prospect was, not merely that I could see those stars north and south which are never visible from the same point on Earth, except in the immediate neighbourhood of the Equator; but that, save on the small space concealed by the Earth's disc, I could, by moving from window to window, survey the entire heavens, looking at one minute upon the stars surrounding the vernal, and at another, by changing my position, upon those in the neighbourhood of the autumnal equinox. By little more than a turn of my head I could see in one direction Polaris (alpha Ursæ Minoris) with the Great Bear, and in another the Southern Cross, the Ship, and the Centaur.
About 23h. 30m., near the close of the first day, I again inspected the barycrite. It showed 1/1100 of terrestrial gravity, an incredibly small change from the ⅛00 recorded at 19h., since it implied a progress proportionate only to the square root of the difference. The observation indicated, if the instrument could be trusted, an advance of only 18,000 miles. It was impossible that the Astronaut had not by this time attained a very much greater speed than 4000 miles an hour, and a greater distance from the Earth than 33 terrestrial radii, or 132,000 miles. Moreover, the barycrite itself had given at 19h. a distance of 28–½ radii, and a speed far greater than that which upon its showing had since been maintained. Extinguishing the lamp, I found that the Earth's diameter on the discometer measured 2° 3' 52" (?). This represented a gain of some 90,000 miles; much more approximate to that which, judging by calculation, I ought to have accomplished during the last four hours and a half, if my speed approached to that I had estimated. I inspected the cratometer, which indicated a force as great as that with which I had started—a force which should by this time have given me a speed of at least 22,000 miles an hour. At last the solution of the problem flashed upon me, suggested by the very extravagance of the contradictions. Not only did the barycrite contradict the discometer and the reckoning but it contradicted itself; since it was impossible that under one continuous impulsation I should have traversed 28–½ radii of the Earth in the first eighteen hours and no more than 4–½ in the next four and a half hours. In truth, the barycrite was effected by two separate attractions—that of the Earth and that of the Sun, as yet operating almost exactly in the same direction. At first the attraction of the former was so great that that of the Sun was no more perceived than upon the Earth's surface. But as I rose, and the Earth's attraction diminished in proportion to the square of the distance from her centre—which was doubled at 8000 miles, quadrupled at 16,000, and so on—the Sun's attraction, which was not perceptibly affected by differences so small in proportion to his vast distance of 95,000,000 miles, became a more and more important element in the total gravity. If, as I calculated, I had by 19h. attained