Does anybody have any information on a telescopic observers post/position/mechanism used by the french artillery.
It is shown in action in the ECPAD film http://archives.ecpad.fr/les-petits-trains-de-la-grande-guerre-2/ At 10 minutes 26 secs the sequence starts where a battery of 120L cannon mounted on Peigne-Canet system carriages fire salvo's from the 60cm railway track and the fall of shot is noted by the observer sat at the top of a telescopic post. At the end of the sequence the observer is brought down as the telescopic post collapses. Is the mechanism mounted on a railway wagon or is it free standing?