Recently I read an interesting biography of Albert Einstein, written by Elma Levinger.
While the entire book was fascinating and intellectually stimulating, there was a particular portion that is the inspiration of this article.
Let me set the background for the point of the article; a couple of renowned professors were attempting to measure differences in the speed of light. The theory being that any moving matter is slowed down in its progress or speed when it meets an obstacle. That obstacle could be a force that can be seen such as air or water, or an unseen force such as gravity or a magnetic force.
This theory is best indicated by measuring the speed of a boat traveling upstream or the same boat traveling across a lake of downstream, obviously the same boat with the same load and power will proceed slower when going upstream than it would going downstream — due to the resistance of the moving water (the obstacle).
The fact that the obstacle is moving in the opposite direction of the boat and the other fact being that speed increases resistance combines to slow the boat when it is going upstream.
Their attempt to measure the speed of light was an attempt to prove that Galileo was correct in saying that the earth was moving through space. Their reasoning being that by measuring the small |cont. insert page >