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"It was my preferred entertainment when I was a kid, so when I set out to be a writer, it was perfectly natural that I should write the sort of stories that I used to enjoy reading."
- John Brunner

Chronoscope  
  A device used to see into specific internals of time.  

As far as I know, this is the first usage of this term.

The hoarse whisper paused, and old Wil McLan limped to the side of the dome. His scarred, trembling hands lifted a black velvet cover from a rectangular block of some clear crystal mounted on the top of a metal cabinet.

“Here is the chronoscope,” he said.

“The latest development of the instrument. Scansion depends upon a special curved field, through which a sub-etheric radiation is bent into the time-axis, projected forward, and reflected from electronic fields back to the instrument. A stereoscopic image is obtained within the crystal screen, through selective fluorescence to the beat frequencies of the interfering carrier waves projected at right angles from below. But I’ll show you Gyronchi.”


(Chronoscope from 'Legion of Time' by Jack Williamson)

THE OLD MAN snapped a switch, manipulated dials at the end of the crystal block. It lit with a cloudy green. The green cleared, and a low cry escaped Lanning’s lips.

For, microscopically clear within the crystal, he saw a miniature world. A broad, silver river cut a fertile green plain dotted with villages. Beyond the river rose two hills.

One was crowned with a tremendous castellated citadel. Its frowning walls and mighty towers were gleaming red metal. Above them flowed banners of yellow and crimson and black. A massive gate opened in the foot of the hill, as he watched, and an armored troop poured out.

“Watch the marchers,’’ rasped McLan.

Technovelgy from Legion of Time, by Jack Williamson.
Published by Astounding Science Fiction in 1938
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 time-telespectroscope from The Exile of Time (1931) by Ray Cummings.

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Additional resources:
  More Ideas and Technology from Legion of Time
  More Ideas and Technology by Jack Williamson
  Tech news articles related to Legion of Time
  Tech news articles related to works by Jack Williamson

Chronoscope-related news articles:
  - Physicist Inspired By SciFi And Seeing Back In Time

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