Astronomical Discoveries Lately Made by Sir John Herschel, LL.D., F.R.S. etc., at the Cape of Good Hope,” purporting to be a republication from a Supplement to the Edinburgh Journal of Science. The heading of the article was striking enough, yet was far from conveying any adequate idea of its contents. When the latter became known, the excitement went beyond all bounds, and grew until the “Sun” office was positively besieged with crowds of people of the very first class, vehemently applying for copies of the issue containing the wonderful details.
As the pamphlet form in which the narrative was subsequently published is now out of print, and a copy can hardly be had in the country, I will recall a few passages from a rare edition, for the gratification of my friends who have never seen the original. Indeed, the whole story is altogether too good to be lost; and it is a great pity that we can not have a handsome reprint of it given to the world from time to time. It is constantly in demand; and, during the year 1859, a single copy of sixty pages, sold at the auction of Mr. Haswell’s library, brought the sum of $3,75. In that same year, a correspondent, in Wisconsin, writing to the “Sunday Times” of this city, inquired where the book could be procured, and was answered that he could find it at the old bookstore, No. 85 Centre Street, if anywhere. Thus, after a search of many weeks, the Western bibliopole succeeded in obtaining a well-thumbed specimen of the precious work. Acting upon this chance suggestion, Mr. William Gowans, of this city, during the same year, brought out a very neat edition, in paper covers, illustrated with a view of the moon, as seen through Lord Rosse’s grand telescope, in 1856. But this, too, has all been sold; and the most indefatigable book-collector might find it difficult to purchase a single copy at the present time. I, therefore, render the inquiring reader no slight service in culling for him some of the flowers from this curious astronomical garden.
The opening of the narrative was in the highest Review style; and the majestic, yet subdued, dignity of its periods, at once claimed respectful attention; while its perfect candor, and its wealth of accurate scientific detail exacted the homage of belief from all but cross-grained and inexorable skeptics.
It commences thus:
“In this unusual addition to our Journal, we have the happiness to make known to the British public, and thence to the whole civilized world, recent discoveries in Astronomy, which will build an imperishable monument to the age in which we live, and confer upon the present generation of the human race a proud distinction through all future time. It has been poetically said, that the stars of heaven are the hereditary regalia of man, as the intellectual sovereign of the animal creation. He may now fold the Zodiac around him with a loftier consciousness of his mental superiority,” etc., etc.
The writer then eloquently descanted upon the sublime achievement by which man pierced the bounds that hemmed him in, and with sensations of awe approached the revelations of his own genius in the far-off heavens, and with intense dramatic effect described the younger Herschel surpassing all that his father had ever attained; and by some stupendous apparatus about to unvail the remotest mysteries of the sidereal space, pausing for many hours ere the excess of his emotions would allow him to lift the vail from his own overwhelming success.
I must quote a line or two of this passage, for it capped the climax of public curiosity: “Well might he pause! He was about to become the sole depository of wondrous secrets which had been hid from the eyes of all men that had lived since the birth of time. He was about to crown himself with a diadem of knowledge which would give him a conscious preëminence above every individual of his species who then lived or who had lived in the generations that are passed away. He paused ere he broke the seal of the casket that contained it.”
Was not this introduction enough to stimulate the wonder bump of all the star-gazers, until
“Each particular hair did stand on end,
Like quills upon the fretful porcupine?”
At all events, such was the effect, and it was impossible at first to supply the frantic demand, even of the city, not to mention the country readers.
I may very briefly sum up the outline of the discoveries alleged to have been made, in a few paragraphs, so as not to protract the suspense of my readers too long.
It was claimed that the “Edinburgh Journal” was indebted for its information to Doctor Andrew Grant—a savant of celebrity, who had, for very many years, been the scientific companion, first of the elder and subsequently of the younger Herschel, and had gone with the latter in September, 1834, to the Cape of Good Hope, whither he had been sent by the British Government, acting in conjunction with the Governments of France and Austria, to observe the transit of Mercury over the disc of the sun—an astronomical point of great importance to the lunar observations of longitude, and consequently to the navigation of the world. This transit was not calculated to occur before the 7th of November, 1835 (the year in which the hoax was printed;) but Sir John Herschel set out nearly a year in advance, for the purpose of thoroughly testing a new and stupendous telescope devised by himself under this peculiar inspiration, and infinitely surpassing anything of the kind ever before attempted by mortal man. It has been discovered by previous astronomers and among others, by Herschel’s illustrious father, that the sidereal object becomes dim in proportion as it is magnified, and that, beyond a certain limit, the magnifying power is consequently rendered almost useless. Thus, an impassable barrier seemed to lie in the way of future close observation, unless some means could be devised to illuminate the object to the eye. By intense research and the application of all recent improvements in optics, Sir John had succeeded in securing a beautiful and perfectly lighted image of the moon with a magnifying power that increased its apparent size in the heavens six thousand times. Dividing the distance of the moon from the earth, viz.: 240,000 miles, by six thousand, we we have forty miles as the distance at which she would then seem to be seen; and as the elder Herschel, with a magnifying power, only one thousand, had calculated that he could distinguish an object on the moon’s surface not more than 122 yards in diameter, it was clear that his son, with six times the power, could see an object there only twenty-two yards in diameter. But, for any further advance in power and light, the way seemed insuperably closed until a profound conversation with the great savant and optician, Sir David Brewster, led Herschel to suggest to the latter the idea of the readoption of the old fashioned telescopes, without tubes, which threw their images upon reflectors in a dark apartment, and then the illumination of these images by the intense hydro-oxygen light used in the ordinary illuminated microscope. At this suggestion, Brewster is represented by the veracious chronicler as leaping with enthusiasm from his chair, exclaiming in rapture to Herschel:
“Thou art the man!”
The suggestion, thus happily approved, was immediately acted upon, and a subscription, headed by that liberal patron of science, the Duke of Sussex, with £10,000, was backed by the reigning King of England with his royal word for any sum that might be needed to make up £70,000, the amount required. No time was lost; and, after one or two failures, in January 1833, the house of Hartley & Grant, at Dumbarton, succeeded in casting the huge object-glass of the new apparatus, measuring twenty-four feet (or six times that of the elder Herschel’s glass) in diameter; weighing 14,826 pounds, or nearly seven tons, after being polished, and possessing a magnifying power of 42,000 times!—a perfectly pure, spotless, achromatic lens, without a material bubble or flaw!
Of course, after so elaborate a description of so astounding a result as this, the “Edinburg Scientific Journal” (i. e., the writer in the “New York Sun”) could not avoid being equally precise in reference to subsequent details, and he proceeded to explain that Sir John Herschel and his amazing apparatus having been selected by the Board of Longitude to observe the transit of Mercury, the Cape of Good Hope was chosen because, upon the former expedition to Peru, acting in conjunction with one to Lapland, which was sent out for the same purpose in the eighteenth century, it had been noticed that the attraction of the mountainous regions deflected the plumb-line of the large instruments seven or eight seconds from the perpendicular, and, consequently, greatly impaired the enterprise. At the Cape, on the contrary, there was a magnificent table-land of vast expanse, where this difficulty could not occur. Accordingly, on the 4th of September, 1834, with a design to become perfectly familiar with the working of his new gigantic apparatus, and with the Southern Constellations, before the period of his