A June 1914 article in Popular Science Monthly explored the precedents and implications of Einstein's 1905 Theory of Relativity.
, who penned Popular Science’s eminently readable explanation of the new theory, pointed out, Einstein’s work—somewhat poetically—was not accomplished in isolation.He who elects to write on a mathematical topic is confronted with a choice between two evils.
Consider now one of the fundamental concepts of mechanics, time. Physicists have not attempted to define it, admitting the impossibility of a definition, but still insisting that this impossibility was not owing to our lack of knowledge, but was due to the fact that there are no simpler concepts in terms of which time can be defined. As Newton says: “Absolute and real time flows on equably, having no relation in itself or in its nature to any external object.
A certain African king, on beholding white men for the first time, reasoned that as all men were black, these beings, being white, could not be men. Are we any more logical when we say that since in our experience no yardsticks have varied appreciably on account of their velocity, hence it is absurd to admit the possibility of such a thing.
Some of the conclusions of the relativity mechanics with reference to velocity are worth noting. In the classical mechanics we were accustomed to reason in the following way: Consider a body with a certain mass at rest. If it be given certain impulse, as we say, it takes on a certain velocity. The same impulse again applied doubles this velocity, and so on, so that the velocity can be increased indefinitely, and can be made greater than any assigned quantity.
It should perhaps be pointed out somewhat more explicitly that these changes in the units of time, space and mass, and in those units depending on them, are changes which are ordinarily looked upon as psychological and not physical. If we imagine that A has a clock and that about him move any number of observers,. B, C, D, . . . , in different directions and with different velocities, each one of these observers sees A’s clock running at a different rate.
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