Mention201152

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so:text Clocks are inherently four-dimensional instruments, since the endpoints of their unit distances are events. Measuring rods, on the other hand, are three-dimensional measuring instruments; their end points are space points and they can be changed into four-dimensional measuring instruments only if events are produced at their end points according to a special rule. (en)
so:isPartOf https://en.wikiquote.org/wiki/Hans_Reichenbach
so:description ยง 29 (en)
so:description The Philosophy of Space and Time (1928, tr. 1957) (en)
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