Henry Wilson DSc.
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Consider four identical clocks, the readings of which are synched while they
are together.
One pair is transported to one end of a 100 metre rigid rod whilst the other
two are similarly moved to the other end.
The rod has a straight line drawn along one edge.
The rod and clocks are moving at 0,9c wrt a frame of reference that, using
Einstein's convention, is declared 'stationary'.