Pagina 97 di 212

To the middle of the lid of the chest is fixed externally a hook

with rope attached, and now a "being" (what kind of a being is

immaterial to us) begins pulling at this with a constant force.

The chest together with the observer then begin to move "upwards"

with a uniformly accelerated motion. In course of time their

velocity will reach unheard-of values-provided that we are

viewing all this from another reference-body which is not being

pulled with a rope.