Journal of Futures Studies

Types of Time Machines and Practical Time Travel

by Charles Tandy

ABSTRACT

Based on specified logical, ontological, and other relevant considerations, it is concluded that in the very-long-run: (1) forward-directed time travel capacity is highly likely; and, (2) past-directed time travel capacity is likely. Four logically possible forward-directed, and four logically possible past-directed, types of (hypothetical) time machines are identified. Two different approaches (the “practical”; the “bi-temporal”) are utilized in attempting to characterize the meaning of time travel. It apparently turns out that the concept of “embedded-subjective time” (i.e. the embedded-temporality of the human time-traveler, as distinguished from either merely-subjective time or literal-wristwatch time) is especially helpful in characterizing whether time travel did or did not occur in a particular circumstance.

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Journal of Futures Studies

Tamkang University, Tamsui Campus
Taipei, Taiwan 251
Tel: 886 2-2621-5656 ext. 3001
Fax: 886 2-2629-6440

ISSN 1027-6084