“Here [in Slough], soon after my arrival, I began to lay the foundation upon which by degrees the whole structure was raised as it now stands, and the speculum being highly polished and put into the tube, I had the first view through it on February 19, 1787. …the first speculum, by a mismanagement of the person who cast it, came out thinner on the centre of the back than was intended, and on account of its weakness would not permit a good figure to be given to it. …A second mirror was cast January 26, 1788, but it cracked in cooling. February 16 we recast it, and it proved to be of a proper degree of strength. October 24 it was brought to a pretty good figure and polish, and I observed the planet Saturn with it. But not being satisfied, I continued to work upon it till August 27, 1789, when it was tried upon the fixed stars, and I found it to give a pretty sharp image. Large stars were a little affected with scattered light, owing to many remaining scratches on the mirror. August the 28th, 1789, having brought the telescope to the parallel of Saturn, I discovered a sixth satellite of that planet, and also saw the spots upon Saturn better than I had ever seen them before, so that I may date the finishing of the forty-foot telescope from that time.”

Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works".

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William Herschel36

German-born British astronomer, technical expert, and compo… 1738–1822

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“The number of stands I invented for these telescopes it would not be easy to assign. …In 1781 I began to construct a thirty foot aërial reflector, and having made a stand for it, I cast the mirror thirty-six inches in diameter. This was cracked in cooling. I cast it a second time, and the furnace I had built in my house broke.”

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Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works".

“In consequence of this arrangement I began to construct the forty-foot telescope about the latter end of 1785. The woodwork of the stand and machines for giving the required motions to the instrument were immediately put in hand. In the whole of the apparatus none but common workmen were employed, for I made drawings of every part of it, by which it was easy to execute the work, as I constantly inspected and directed every person's labor; though sometimes there were not less than forty different workmen employed at the same time. While the stand of the telescope was preparing, I also began the construction of the great mirror, of which I inspected the casting, grinding, and polishing, and the work was in this manner carried on with no other interruption than that occasioned by the removal of all the apparatus and materials from where I then lived, to my present situation at Slough.”

William Herschel (1738–1822) German-born British astronomer, technical expert, and composer

Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works"

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Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter V, Sec. 7
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“God manifests himself to us in the first degree through the life of the universe, and in the second degree through the thought of man. The second manifestation is not less holy than the first. The first is named Nature, the second is named Art.”

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Dieu se manifeste à nous au premier degré à travers la vie de l’univers, et au deuxième degré à travers la pensée de l’homme. La deuxième manifestation n’est pas moins sacrée que la première. La première s’appelle la Nature, la deuxième s’appelle l’Art.

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