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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

Time-Telespectroscope.  
  See other time-travelers.  

Each of the cages was equipped with an intricate device, strange of name, which Larry and I have since termed a Time-telespectroscope. Larry saw it now as a small metal box, with tuning vibration dials, batteries, coils, a series of tiny prisms and an image-mirror—the whole surmounted by what appeared the barrel of a small telescope. Harl had it leveled and was gazing through it. [1]

[1] The workings of the Time-telespectroscope involve all the intricate postulates and mathematical formulae of Time-traveling itself. As a matter of practicality, however, the results obtained are simple of understanding. The etheric vibratory rate of the vehicles while traveling through Time was constantly changing. Through the telespectroscope one cage was visible to the other across the five hundred feet of intervening Space when they approached a simultaneous Time; when they, so to speak, were tuned in unison.

Thus, Harl explained, the other cage would show as a ghost, the faintest of wraiths, over a Time-distance of some five or ten years. And the closer in Time they approached it, the more solid it would appear.

From The Exile of Time, by Ray Cummings.
Published by Astounding Stories in 1931
Additional resources -

Compare to the time machine from The Time Machine (1895) by HG Wells, the Dutch clock from The Clock That Went Backward (1881) by Edward Page Mitchell, the Anachronopete from El Anachronopete (1887) by Enrique Gaspar, precogs from The Minority Report (1956) by Philip K. Dick and the chronoscope from Legion of Time (1938) by Jack Williamson.

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Additional resources:
  More Ideas and Technology from The Exile of Time
  More Ideas and Technology by Ray Cummings
  Tech news articles related to The Exile of Time
  Tech news articles related to works by Ray Cummings

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