Haven't read it since I was a child, but I recall a story involving a young man whose father built some kind of time portal that appeared as a circular rainbow. ("No end, therefore no pot of gold" was mentioned at one point.)

During the story, I believe they move through it at least once or twice in its early, dinosaur era incarnation, and at one point have it suffer major issues when a dinosaur steps on it, and a tube-shaped volume of Dino comes through it.

Later, it's pointed at a later (historically) time, where the protagonist befriends a young girl (and makes her some clothing, which she later takes off, points at him and puts back on, to his embarrassment, as she tries to explain where it came from) who, at the end of the story, inadvertently came back with them to the 'modern' age.

Any ideas?

  • Actually, the duplicate is the other way around; mine was posted (and answered) six years ago.
    – K-H-W
    Commented Aug 5, 2017 at 14:28
  • 2
    That's not how our duplicate policy works. The answer on the other post is better than the one here and includes more details.
    – Edlothiad
    Commented Aug 5, 2017 at 14:31
  • Per this meta, quality is more important than age when closing as duplicates. This is in line with the whole point of the duplicate system, which aims at pointing people at better questions and answers. Commented Aug 5, 2017 at 14:40
  • Perhaps, but the reality is that the new question should have been closed, pointing at this one; it's timing only that allows the new one to be kept because of a 'better' answer. This policy really needs revisited, I would suggest.
    – K-H-W
    Commented Aug 5, 2017 at 14:45
  • Actually the newer one couldn't be closed as a duplicate UNTIL it had the same answer, as per our story-id dupe policy. These two policies are what's best for the site, unfortunately this means your question should be closed
    – Edlothiad
    Commented Aug 5, 2017 at 14:56

1 Answer 1


The book you are looking for is Tunnel Through Time, a 1966 novel by Lester Del Rey.

  • Bingo! That's the one; thank you VERY much!
    – K-H-W
    Commented Jun 25, 2011 at 21:08
  • @Keith: You're quite welcome. :)
    – rintaun
    Commented Jun 26, 2011 at 1:50

Not the answer you're looking for? Browse other questions tagged or ask your own question.