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He could explain the laws of mechanics, and tell his wonderstruck comrades what is meant by the resultant of several forces and the equilibrium of forces, giving them unexpected notions about kinematics and dynamics.
Since receiving your telegram, I have brushed up a little my knowledge of both kinematics and dynamics, though it is quite apparent that the operation of these machines, accompanied, as it is said, by many restraints and perturbations, falls under the latter branch.
Since the parallelogram of forces is the prototype of each further mathematical representation of physical force-relationships in nature, the conceptual link thus forged between it and the basic theorem of kinematics has led to the conviction that the fact that natural events can be expressed in terms of mathematics could be, and actually has been, discovered through pure logical reasoning, and thus by the brain-bound, day-waking consciousness 'of the world-spectator.
The contrast between ether and matter would fade away, and, through the general theory of relativity, the whole of physics would become a complete system of thought, like geometry, kinematics, and the theory of gravitation.
The space-time theory and the kinematics of the special theory of relativity were modelled on the Maxwell-Lorentz theory of the electromagnetic field. This theory therefore satisfies the conditions of the special theory of relativity, but when viewed from the latter it acquires a novel aspect.
This is the vibratory and silent movement which is invoked by physicists to explain the peculiarities of subjective sensation; so that the interferences, the pulsations of sound, and, in fine, the whole physiology of the ear, is treated as a problem in kinematics, and is explained by the composition of movements. What kind of reality do physicists then allow to the displacements of matter?
They hung aloof in his consciousness, shadow pictures, colourless and remote.... That zestful young life at New Haven, the swift years of it, the fine last day of it, Yale honours upon him, his enthusiasms cutting away into the future, his big shoulders squared, his face set toward great things, the righting of wrongs, grand reforms, the careers of nations.... A bachelor hotel; a club whose windows looked out on the avenue; an office where Carington and he had pretended to work down on Nassau Street; drawing-rooms where Carington and he had pretended to be in love, on various streets; the whole gay, meaningless panorama of his life as a homeless, unplaced New York sojourner, who had considered that he had too much money to be anything seriously and too little money to do anything effectively.... Then another picture, jerking, mazy, a study in kinematics "Crazy Monday" on the Street, Carington and he swept along in that day's whirlwind of speculation.... A blank in the panorama while he got used to things and thought things out.... Then a wintry twilight at the club, Carington and he by the window, talking it over, looking out upon the drifted light of the city, loving the city, in the way of New Yorkers.
In fact, it is the basic theorem of kinematics. We now turn to the second theorem which speaks of an outwardly similar relationship between forces.
Instead of the parallelogram of forces following from the parallelogram of movements, and the entire science of dynamics from that of kinematics, our very faculty of thinking in kinematic concepts is the evolutionary product of our previously acquired intuitive experience of the dynamic order of the world.
The above statement, like others of Eddington's, has been Contested from the side of professional philosophy as logically untenable. Our own further discussion will show that it accords with the facts. 4 Both words, kinematics and kinetics, are derivatives of the Greek word kinein, to move. The term 'kinematic' is used when motion is considered abstractly without reference to force or mass.
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