On the Ring of Saturn, and the Rotation of the fifth Satellite upon its Axis;" "Miscellaneous Observations." (Philosophical Transactions of the Royal Society of London, Vol. 82 for the Year 1792, Part I & Part II, pp. 1-22, 23-27) by Herschel, William - 1792

1806. (London, Bulwer and Co., 1806). Large 4to. Without wrappers as extracted from "Philosophical Transactions of the Royal Society of London." Year 1806-Part II. Herschel's memoir pp. 455-466 a. 1 engraved plate. A brownspot in inner lower margin on the 3 first leaves. Some brownspots to the plate. First appearance of Herschel's last paper on Saturn and its ring. He determined Saturns period of rotation and he discovered two more inner satellites. One of these, Iapetus, he found to perform its rotation, but he believed, wrongly, that the rings were solid.

1806. (London, Bulwer and Co., 1806). Large 4to. Without wrappers as extracted from "Philosophical Transactions of the Royal Society of London." Year 1806-Part II. Herschel's memoir pp. 455-466 a. 1 engraved plate. First appearance of Herschel's last paper on Saturn and its ring. He determined Saturns period of rotation and he discovered two more inner satellites. One of these, Iapetus, he found to perform its rotation, but he believed, wrongly, that the rings were solid.

1792. London, Peter Elmsly, 1792. 4to. In recent marbled paper wrappers. Extracted from "Philosophical Transactions". Including title-page of volume. Leaves reinforced in margin. (2), iii-vi, (2), 28 pp. + 1 folded plate. First edition of Herschel's important paper on his observations of the rings of Saturn. "Saturn exercised a special fascination for Herschel, and between 1789 and 1808 he devoted seven papers and part of an eighth to the planet, its ring, and its satellites.On 19 August 1787 Herschel suspected he had found a sixth and previously unknown satellite, but he was not able to confirm this until 28 August 1789, when his forty-foot telescope came into commission. A few days later he found a seventh satellite. For some months he carefully tracked the satellites, establishing for Mimas and Enceladus periods within seconds of the modern values, and giving evidence to show that Iapetus rotates in its period of revolution.He also made careful observations of the rings, which he believed to be… Read More

1790. London, Lockyer Davis, 1790 4to. In recent marbled paper wrappers. Extracted from "Philosophical Transactions". Including title-page of volume. Leaves reinforced in margin. Very light brownspotting through out and light offsetting from folding plate as usual. (I)-IV, 427-496 pp. + 1 folded plates. First edition of Herschel's important paper on his observations of Saturn. "Saturn exercised a special fascination for Herschel, and between 1789 and 1808 he devoted seven papers and part of an eighth to the planet, its ring, and its satellites.On 19 August 1787 Herschel suspected he had found a sixth and previously unknown satellite, but he was not able to confirm this until 28 August 1789, when his forty-foot telescope came into commission. A few days later he found a seventh satellite. For some months he carefully tracked the satellites, establishing for Mimas and Enceladus periods within seconds of the modern values, and giving evidence to show that Iapetus rotates in its period of… Read More

1790. London, Peter Elmsly, 1790. 4to. In recent marbled paper wrappers. Extracted from "Philosophical Transactions". Including title-page of volume. Title-page with professional repair to lower margin, not affecting text. Leaves reinforced in margin. Very light brownspotting through out and light offsetting from folding plate as usual. (2), iii-vi, (2), (1)-20 pp. + three folded plates. First edition of Herschel's important paper on his observations of the rings of Saturn. "Saturn exercised a special fascination for Herschel, and between 1789 and 1808 he devoted seven papers and part of an eighth to the planet, its ring, and its satellites.On 19 August 1787 Herschel suspected he had found a sixth and previously unknown satellite, but he was not able to confirm this until 28 August 1789, when his forty-foot telescope came into commission. A few days later he found a seventh satellite. For some months he carefully tracked the satellites, establishing for Mimas and Enceladus periods within seconds… Read More