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This consideration must alter the form of our proposed inquiry; for the question being thus at least partly decided, since it is ascertained that we … - William Herschel
" "This consideration must alter the form of our proposed inquiry; for the question being thus at least partly decided, since it is ascertained that we have rays of heat which give no light, it can only become a subject of inquiry whether some of these heat-making rays may not have a power of rendering objects visible, superadded to their now already established power of heating bodies. This being the case, it is evident that the onus probandi [burden of proof] ought to lie with those who are willing to establish such an hypothesis, for it does not appear that Nature is in the habit of using one and the same mechanism with any two of our senses. Witness the vibration of air that makes sound, the effluvia that occasion smells, the particles that produce taste, the resistance or repulsive powers that affect the touch—all these are evidently suited to their respective organs of sense.
English
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About William Herschel
Sir Frederick William Herschel KH FRS (German: Friedrich Wilhelm Herschel) (15 November 1738 – 25 August 1822) was a German-born British astronomer, technical expert, telescope maker, organist and composer who became famous for discovering Uranus. He also discovered infrared radiation and made many other contributions to astronomy. His sister Caroline Herschel and son, Sir John Herschel, were also notable astronomers.
Also Known As
Native Name:
Friedrich Wilhelm Herschel
Alternative Names:
Frederick William Herschel
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Sir William Herschel
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Sir Frederick William Herschel
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Wilhelm Herschel
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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.
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