The foregoing is a literal copy of the original manuscript; and such readers of this article as may think proper to compare it with the printed description of Mr. Rittenhouse’s Orrery, communicated to the American Philosophical Society by Dr. Smith, on the 21st of March 1768, and contained in the first volume of that Society’s Transactions, will find some (though, on the whole, not very essential) differences, in the two descriptions. The concluding paragraph, indeed,—designated, in each, by a N. B.—is materially variant in the two: and it appears, by its having been announced in the published (and later) account of this machine, that, “the clock part of it may be contrived to play a great variety of Music,” (a suggestion wholly omitted in Mr. Rittenhouse’s original communication, made to the Rev. Mr. Barton,) that the philosophic Artist had been afterwards induced, in one particular at least, “to comply with the prevailing taste.”[140] But this may be readily accounted for: our artist had previously made some extremely curious and beautiful Time-pieces, to each of which was attached the mechanism of a Musical Clock, in addition to a limited Planetarium, in miniature. These were in the hands of gentlemen of respectability and taste:[141] and they were much and generally admired, as well for the great ingenuity displayed by the constructor, in these combined and pleasing operations of his machinery, as for the superior accuracy and beauty of the workmanship; qualities eminently conspicuous in all his mechanical productions. ----- Footnote 140: This design was, however, finally abandoned. Footnote 141: One of these valuable clocks, which is of a large size, with an accurate little planetarium attached to its face and placed above the dial-plate,[141a] was made for the late Mr. Joseph Potts, of Philadelphia county, who paid for it, as the writer is informed, six hundred and forty dollars. In the spring of the year 1774, it was purchased by the late Mr. Thomas Prior, of Philadelphia; to whom, it is said, general Sir William Howe made an offer of one hundred and twenty guineas for it, shortly before the evacuation of that city, in 1778. It is also said, that Don Joseph de Jaudenes, late minister of Spain to the United States, offered Mr. Prior eight hundred dollars for this clock, with a view of presenting it to his sovereign. Mr. Prior, however, retained it until his death, in the spring of the year 1801: after which, it passed through two other hands, successively, into the possession of Professor Barton, of Philadelphia, whose property it now is. Footnote 141a: The area of the face of the dial plate is twenty inches square, and the motions and places of the planets of our system are represented on a circular area of eight inches in diameter. -----