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Page 351 - I often say that when you can measure what you are speaking about and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind ; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the stage of science. — Kelvin.
Page 39 - And this shall be a sign unto thee from the Lord, that the Lord will do this thing that he hath spoken; behold, I will bring again the shadow of the degrees, which is gone down in the sun-dial of Ahaz, ten degrees backward. So the sun returned ten degrees, by which degrees it was gone down. The
Page 199 - He his fabric of the heavens Hath left to their disputes, perhaps to move His laughter at their quaint opinions wide; Hereafter when they come to model heaven And calculate the stars, how will they wield The mighty frame! how build, unbuild, contrive To save appearances! how gird the sphere With centric and eccentric scribbled o'er, Cycle in epicycle, orb in orb!
Page 303 - IL The alteration of motion is ever proportional to the motive force impressed, and is made in the direction of the right line in which that force is impressed. III. To every action there is always opposed an equal reaction
Page 372 - is the same as that of the luminiferous medium, if these two coexistent, coextensive and equally elastic media are not rather one medium. . . . We can scarcely avoid the inference that light consists in the transverse undulations of the same medium which is the cause of electric and magnetic phenomena. — Maxwell.
Page 303 - famous Laws of Motion: I. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.
Page 213 - his third law: — The squares of the times of revolution of any two planets (including the earth) about the sun are proportional to the cubes of their mean distances from the sun. In
Page 365 - Anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything, capable of being excited, and communicated, in the manner the heat was excited and communicated in these experiments, except it be MOTION. The
Page 269 - Our business was (precluding matters of theology and state affairs) to discourse and consider of philosophical enquiries, and such as related thereunto: — as Physick, Anatomy, Geometry, Astronomy, Navigation, Staticks, Magneticks, Chymicks, Mechanicks, and Natural Experiments; with the state of these studies and their cultivation at home and abroad. We then discoursed of the circulation of the blood, the valves in the veins, the