A device which marks or records time or time intervals.
3
A combination of a watch and a stopwatch.
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: