tape chronograph

Machine-translated from the French article

The recording chronograph, tape chronograph, or sometimes simply chronograph, was a recording instrument used between 1870 and 1940 in observatories for time-stamping and the precise estimation of longitudes. The recording is made on a tape a few centimetres wide, driven at a few cm/s by the fusee of a clock. The recording is produced by two styluses operated by electrical switching: one marks the seconds given by an astronomical clock, a marine chronometer or a radio signal, the other is triggered by the operator or by a semi-automatic recording micrometer.