"Time tourists" will be able to explore the past but not interfere

Neil Ardley : writer, musician
"Time tourists” could enter the time machine, which would then somehow show them the events of a chosen era and history unfold before them without allowing them to actually get out and live in it. The time machine won't show the future, so that people couldn't change what's going to happen.

Ardley, Neil. 1982. Fact or fantasy? London: F. Watts.