, Volume 24, Issue 1–2, pp 117–132 | Cite as

On travelling backward in time

  • Robert Weingard
Part I/Causality And Time


We must conclude, from the above discussion, that Putnam has not satisfactorily explained how a person can go back in time and thus has not offered any compelling reason why we should accept his description of Oscar rather than his objector's description. However, earlier in our discussion, a possible way to show that Oscar did go back in time came to light: namely, if it could be shown that Oscar2 was at B at t1because Oscar1 entered the time machine at t2. Thus, if backward causation were possible, such backward causes could be used to send a person back in time. But whether backward causation is a conceptual possibility or not is the topic for another paper.


Time Machine Compelling Reason Conceptual Possibility 
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  1. Earman, J., ‘On Going Backwards in Time’, Philosophy of Science 34 (1967), 211–22.Google Scholar
  2. Feynman, R. P., Theory of Fundamental Processes, W. A. Benjamin, New York, 1962.Google Scholar
  3. Graves, J. C. and Roper, J. E., ‘Measuring Measuring Rods’, Philosophy of Science 32 (1965), 39–55.Google Scholar
  4. Putnam, H., ‘It Ain't Necessarily So’, Journal of Philosophy 59 (1962), 658–71.Google Scholar
  5. Reichenbach, H., The Philosophy of Space and Time, Dover, New York, 1958.Google Scholar

Copyright information

© D. Reidel Publishing Company 1972

Authors and Affiliations

  • Robert Weingard
    • 1
  1. 1.Rutgers CollegeUSA

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