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Galileo's discovery of Jupiter's satellites was followed by the discovery of his belts. Zucchi and Torricelli seem to have seen them. Fontana, in 1633, reported three belts. In 1648 Grimaldi saw but two, and noticed that they lay parallel to the ecliptic. Dusky spots were also noticed as transient. Hooke measured the motion of one in 1664.
Of all the ideas that human reason can form, Hooke considered the simplest and the most fundamental to be the geometrical concepts of point and straight line. Undoubtedly we are able to think these, but the naïve consciousness takes for granted that it also perceives them as objective realities outside itself, so that thoughts and facts correspond to each other.
Hooke, in his day, expressed "his surprise at the obstinacy of seamen in continuing, after what appeared the clearest demonstration to the contrary, to prefer what are called bellying or bunting sails, to such as are hauled tight." The doctor said that he would, at some future time, add the test of experiment to mathematical investigation in support of his theory.
Such a manner of speech is fit for those judges that a man would corrupt by hooke or crooke, by right or wrong, or for children and the common people, unto whom a man must tell all, and see what the event would be. I come readie prepared from my house.
The detestable methods of Justice Darcy come out in the case of a woman from whom he threatened to remove her imps if she did not confess, and by that means trapped her into the incriminating statement, "That shal ye not." William Hooke had heard William Newman "bid the said Ales his wife to beate it away."
What pleasure can be more, he exclaims, when men are tired of planting vines and fruits and ordering gardens, orchards and building to their mind, than "to recreate themselves before their owne doore, in their owne boates upon the Sea, where man, woman and child, with a small hooke and line, by angling, may take divers sorts of excellent fish at their pleasures?
Owing to an error in the determination of the earth's distance from the sun, the velocity assigned to light by both Roemer and Bradley is too great. With a close approximation to accuracy it may be regarded as 186,000 miles a second. By Roemer's discovery, the notion entertained by Descartes, and espoused by Hooke, that light is propagated instantly through space, was overthrown.
The all-compassing genius of Robert Hooke had, indeed, very nearly apprehended it more than a century before, as Young himself points out, but no one else bad so much as vaguely conceived it; and even with the sagacious Hooke it was only a happy guess, never distinctly outlined in his own mind, and utterly ignored by all others.
Hooke, and others, to Colonell Blunts, to consider again of the business of charriots, and to try their new invention. Which I saw here my Lord Bruncker ride in; where the coachman sits astride upon a pole over the horse, but do not touch the horse, which is a pretty odde thing; but it seems it is most easy for the horse, and, as they say, for the man also.
Hooke persisted in the declaration that he possessed the method, but avowed it to be his intention to conceal it for time. He promised, however, to show it to Sir Christopher; but there is every reason to believe that this promise was never fulfilled. In August, 1684, Dr. Halley went to Cambridge for the express purpose of consulting Newton on this interesting subject.
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