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An electronic instrument used for measuring extremely short intervals of time, such as the time of passage of a rifle bullet between two points.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an instrument for comparing the readings of two clocks.

The two disks of a chronoscope have narrow, uniformly spaced radial slits: one disk has ten slits numbered from 0 to 9, and the other has 100 slits numbered from 0 to 99. A flash lamp is positioned behind the disks, which rotate on a single axis with angular velocities of 1 and 10 revolutions per second, respectively. The flash lamp fires upon reception of electrical signals from the clocks being compared, illuminating the slits and numbers above the lamp at the given instant. A set of fixed index marks permits the observer to determine readings down to one-tenth of a division of the second disk, which corresponds to a nominal precision of 0.1 millisecond. The difference in the readings of various clocks may be determined with high accuracy by feeding electrical pulses from the clocks to a chronoscope. Photographic chronoscopes are equipped with a device for photographing the disk readings.

Chronoscopes were commonly used in astronomy, physics, and experimental biology until the mid-20th century; they have been replaced by more advanced electronic instruments.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The artistry of Farzin and Balteo-Yazbeck's piece lies in what they chose to select from the "Chronoscope" archives.
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He writes "How do they know?" next to Scudamour's statement (written in the usual ink) that they rarely can see things "ten miles away from the Dark Tower" while viewing Othertime scenes through the chronoscope. How would they know the relative distances between sights that materialize due to the random "interest lines" taken by the device?
The Scotsman in this fragment has been supervising Lewis's chronicles of the chronoscope adventures, almost reading over his shoulder and commenting all along, and in this case he smirks at Lewis mischievously in stating that Scudamour claimed to have got Lewis reminiscing about war experiences and the books he had written--elements of Lewis-the-author's real past--which have the effect of cheering up Lewis-the-character (who is now narrating).
Considering his lifelong habit of reserve, it's interesting that these self-referential remarks made their way at all into the narrative's initial draft, and curious that memories of The Great War, undoubtedly a traumatic experience, had a soothing effect on Lewis-the-character in the midst of so much degeneracy observed with the chronoscope that had rattled him.
chronoscope: Its adjustments, accuracy, and control.