Flaman Speed Indicator and Recorder

The Flaman Speed Indicator and Recorder was a device patented in 1901 by Nicolas Charles Eugène Flaman of France for indicating the current speed of a vehicle (for example a railway locomotive) and recording it on a paper tape that could be unrolled and examined at the end of a run to provide evidence of the speeds attained on the journey.

Three graphs were recorded, the first being time elapsed (with the trace moving vertically if the train was stationary), the second being a speed curve.

[2] and the third recording the driver's attentiveness to signals ("Vigilance") by marking one tick above a line when the driver depressed a button, and another below the line when the engine went over the signal ramp.

Read together, it was possible to determine exactly what speed the locomotive had been travelling at any point in time or distance.

[3] The Flaman recorder was used in a number of countries, and in particular France on the Nord, Est, PLM and Etat railways.