Part 54

Footnote 228:

There was some unaccountable mismanagement in the whole of this business, on the part of the society. Mr. Mayer’s letter is published entire, in the original Latin: but the translation ends, abruptly, in the middle of a paragraph. When Mr. Rittenhouse was directed by the society to answer that letter, he requested the writer of these memoirs to furnish him with an English translation of it, for the purpose of comparing with it one which he had himself attempted. That translation (which, by Mr. Rittenhouse’s desire, was made to conform pretty closely to the original,) is inserted in the Appendix, entire, together with the hitherto unpublished answer.

Footnote 229:

Charles Theodore, Duke of Bavaria, who is denominated by Lalande, “an illustrious patron of the sciences.”

It is about fifty years since this prince built an observatory near the gardens of Schwetzingen, two leagues from the city of Manheim; and there Father Christian Mayer pursued his astronomical labours for several years. But about the year 1772, the same prince erected another and a more magnificent edifice (of 108 Rhenish feet in height,) at Manheim, for the same purpose: where Father Mayer made numerous and highly estimable observations; as may be collected from his work, entitled, De novis in Cælo Siderio Phænomenis. Lalande places this observatory in N. Lat. 49° 29′ 15″.

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On a perusal of the answer to Mr. Mayer’s communication (in the Appendix,) it will be found, that the “eminent utility,” which he expected to result, at some future day, to astronomical science, from a prosecution of such discoveries as he had recently made among the fixed stars, had been long before anticipated by our Astronomer. In that answer Mr. Rittenhouse mentions, that he is induced to request his correspondent’s acceptance of a copy of the Oration he had delivered before the American Philosophical Society, “some years” before:—“because,” says the writer, “I therein gave my opinion, that the fixed stars afforded the most spacious field for the industry of future astronomers; and expressed my hopes, that the noblest mysteries would sometime be unfolded, in those immensely distant regions.”

This early opinion of his own concerning the fixed stars, to which Mr. Rittenhouse refers in his letter, is expressed in his Oration, in this short paragraph: “If astronomy shall again break those limits that now confine it, and expatiate freely in the superior celestial fields,—what amazing discoveries may yet be made among the fixed stars! That grand phænomenon the Milky way, seems to be the clue, that will one day guide us.”

Such were the expectations entertained by our Philosopher, more than three years before the date of Mr. Mayer’s communication of his discovery to the Philosophical Society;—a discovery which Mr. Rittenhouse, in his letter to that great astronomer, styles “excellent;” and one that proves his own “presage” to have been well founded. He, at the same time, modestly suggests to Mr. Mayer, the institution of a comparison between the many observations he had already made, in order to determine, whether the several changes observed will agree with any imagined motion of our system; remarking, that those he had communicated, seemed to favour such a supposition.

How important soever, in relation to astronomy, the phænomena observed by Mayer may be, the honour of first discovering them certainly belongs to him. Mr. Rittenhouse was not the discoverer: nor had he ever access to so complete and expensive an astronomical apparatus, as that used by Mayer on the occasion, and with which he was furnished by means of princely munificence. But all candid men of science will, nevertheless, be disposed to allow the American Astronomer no inconsiderable share of merit for the early “presage,” which his deep-discerning and vastly comprehensive mind enabled him to suggest, of some such future discoveries.

The writer of these memoirs deemed it his duty to do justice to the memory of the subject of them, by giving publicity to these interesting circumstances; and the performance of this duty is the more gratifying to the writer, because he alone possesses a knowledge of all the facts he has stated, concerning them.

The late discoveries of Dr. Herschel, among the fixed stars, in addition to those previously made by Mr. Mayer, have in a greater degree realised the expectations which were formed, many years before either, by our Astronomer; such, indeed, as are almost entitled to the character of prescient annunciations, respecting that portion of the heavens which should, some time or other, be the scene of the most important astronomical discoveries. According to Herschel, the Milky Way is an immense nebula, near one of the sides of which, is placed the solar system; and he imagines, that each nebula, of which he had observed more than nine hundred, consists of a group of suns, with their attendant planets!

Mr. Rittenhouse never possessed the means of acquiring such stupendous and costly telescopes, as those used by Herschel, for the purpose of exploring the heavens. But the penetrating genius of our countryman seems to have contemplated, by anticipation, the actual existence of those sublime phænomena, some of which the vastly superior instruments of the Germano-Anglican Astronomer have since manifested; when, in language apparently prophetic, but certainly dictated by the most exalted pre-conceptions of the grandeur of celestial objects which were yet undiscovered, the American Philosopher observes, as he does in his Oration,—that “all yonder stars innumerable, with their dependencies, may perhaps compose but the leaf of a flower in the Creator’s garden, or a single pillar in the immense building of the Divine Architect.” Well might he exclaim, with rapturous extacy, after so beautiful and sublime a reflection,—“Here is ample provision made for the all-grasping mind of man!”

It will be evident to such as duly reflect on this subject, that those expectations which occupied the mind of Mr. Rittenhouse, so long since as the year 1775—concerning the “amazing discoveries” which should, at some future period, be made among the fixed stars, were not mere conjectures or vague hypotheses; but, that they were rational anticipations of realities, founded on the most acute observation and laborious research, as well as the profoundest philosophical judgment. As Newton is said to have revealed those truths in physics, which his predecessor, Bacon, had preconceived; so, that great practical astronomer, Herschel, and some other eminent observers of our day, have been enabled, by means of the very important improvements recently made in astronomical instruments, to verify a grand hypothesis in his favourite science, which had long before been conceived by the towering genius of Rittenhouse.

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Footnote 230:

Among those who have observed, since Dr. Herschel’s discovery of the Georgium Sidus, new phænomena in the heavens, may be ranked the following:

M. Piazzi, a Sicilian astronomer, who, on the 1st of January, 1801, discovered a small planet revolving round the sun, between the orbits of Jupiter and Mars, named Ceres: Dr. Olbers, of Bremen, who, on the 28th of March in the following year, discovered another small planet, to which he gave the name of Pallas, which revolves round the sun nearly at the same distance, and in the same time, as Ceres; and afterwards, viz. on the 29th of March, another planet, which he called Vesta; similar to the others, both in its position and magnitude: and

Mr. Harding, of Lilienthal, who, between these two last mentioned periods, viz. on the 1st of September, 1804, discovered a fourth planet (but the third in the order of time,) also small, to which he gave the name of Juno; resembling Pallas in a great excentricity of its orbit, and the inclination of this to the ecliptic, and placed at nearly the same distance from the sun.

The Georgium Sidus was not discovered until about fifteen years before Dr. Rittenhouse’s death; and the first discovered of the four last mentioned planets was not known in America, for almost five years after that event.

Footnote 231:

“There is perhaps no individual of the present age,” (says the writer of the article “Astronomy,” in the New Edinburgh Encyclopædia, now publishing under the direction of Dr. Brewster,) “to whom practical astronomy owes deeper and more lasting obligations, than to Mr. Edward Troughton. The great improvements which he has made upon astronomical instruments, and the extreme accuracy with which he divides them, have rendered his name celebrated in every part of Europe, and have inspired the practical astronomer with a confidence in his observations, which he had hitherto been unaccustomed to feel. There is scarcely an observatory of any consequence, either in this country” (Great-Britain,) “or the continent, that does not contain some of Mr. Troughton’s instruments; and there are few series of observations, in which they have not been used. The admirable observations of Mr. Pond, on the declinations of the principal stars, were made with an azimuth circle of Mr. Troughton’s construction. The mural circle, which Mr. Groombridge of Blackheath uses, in his numerous and accurate observations, was made by the same artist. The splendid mural circle, of 6 feet 2 inches radius, which Mr. Troughton is at present preparing for the Royal Observatory at Greenwich, will cost 700l.” (equivalent, in money of the United States, to $311111/100,) “and will be one of the most magnificent and accurate instruments that has ever been erected.”

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From the time our astronomer became established in Philadelphia, until the year 1787, he resided in a house belonging to the late Mr. Thomas Clifford, at the south-east corner of Arch and (Delaware) Seventh streets: But the mansion which Mr. Rittenhouse had erected for himself, the preceding year, on his Observatory-lot at the diagonal corner of those streets, being then compleated, he removed thither; and there continued his residence, during the residue of his life. It was about this time, perhaps towards the close of the year 1786, that he was compelled by the duties of his office, as sole trustee of the loan-office, to put in suit the bonds which accompanied the mortgages of sundry delinquent loanees. The bonds were placed in the hands of the Writer of these Memoirs, for that purpose; with instructions to treat the delinquents with every reasonable degree of forbearance. This lenity was observed, agreeably to Mr. Rittenhouse’s desire; few suits were instituted, and payment of the monies due, or the greater part of them, was not long after obtained.

Early in the year 1787, the expected appearance of a new comet in that year, engaged Mr. Rittenhouse’s attention: and on that occasion he addressed the following letter to Mr. Ellicott.

“Philadelphia, Feb. 12, 1787.

“Dear Sir,

“The elements of the new Planet have been pretty well determined by several European astronomers. The following I have extracted from the Almanack for 1787.