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plural chronographs
(obsolete) A chronogram.
A device which marks or records time or time intervals. examples
A combination of a watch and a stopwatch. quotations examples
Along this critical length Sir Nigel [Gresley], completely unmoved and in a very cheerful humour, came into my compartment and sat down next to me, with the immense chronograph in his hand that he had had made specially for speed recording; [...].
1941 June, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 263
third-person singular simple present chronographs, present participle chronographing, simple past and past participle chronographed
(firearms) To make an accurate measurement of the speed of a projectile. examples