Quotation from "Relativity" - The Special and General Theory by Albert Einstein, translated by Robert W. Lawson, Introduction by Roger Penrose, Commentary by Robert Geroch, and a Historical Essay by David C. Cassidy
Quotations from the commentary by Robert Geroch:
"There are many other methods to measure "the length of a moving rod."
"There is considerably less reason to believe that these various methods must all agree in this realm. In fact, according to relativity theory they do not. For each different method there will be a factor - which can be calculated within special relativity .. . For one method ... might always yield precisely the rest-length of the rod; and for some other method ... the rod ... would be deemed to have lengthened rather than shortened.
Thus "moving objects contract" is not a very good summary of what is predicted by special relativity."
"Similar remarks apply to "time dilation." There are numerous experiments the results of which deserve to be called the "elapsed time" between two events; and different experiments will generally yield different answers. Einstein's time dilation refers to one particular choice of an experiment."
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