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This question already has an answer here:

Haven't read it since I was a child, but I recall a story involving a young man who's 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 thru it at least once or twice in it's 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 thru 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?

marked as duplicate by Edlothiad, Gallifreyan, Bellatrix, KutuluMike, K-H-W Aug 5 '17 at 16:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Actually, the duplicate is the other way around; mine was posted (and answered) six years ago. – K-H-W Aug 5 '17 at 14:28
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    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 Aug 5 '17 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. – Gallifreyan Aug 5 '17 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 Aug 5 '17 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 Aug 5 '17 at 14:56
14

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 Jun 25 '11 at 21:08
  • @Keith: You're quite welcome. :) – rintaun Jun 26 '11 at 1:50

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