"The theory of relativity is intimately connected with the theory of space and time. I shall therefore begin with a br…"

"Before the development of the theory of relativity it was known the principle of energy and momentum could be express…"

"A little reflection will show that the law of the equality of the inertial and gravitational mass is equivalent to th…"

"A material particle upon which no force acts moves, according to the principle of inertia, uniformly in a straight li…"

"Some try to explain Hubble's shift of spectral lines by means other than the Doppler effect. There is, however, no su…"

"It is the essential achievement of the general theory of relativity that it has freed physics from the necessity of i…"

"In May 1921 Albert Einstein delivered a series of lectures at Princeton University on the broad topic of relativity. …"

"Are not gross Bodies and Light convertible into one another, and may not Bodies receive much of their Activity from t…"

"Have not the small Particles of Bodies certain Powers, Virtues, or Forces, by which they act at a distance, not only …"

"How these Attractions may be perform'd, I do not here consider. What I call Attraction may be perform'd by impulse, o…"