In finnish the item is a "tähtäyspylväs", a sighting mount perhaps in english.John Hilly wrote:For a moment I wasn't sure if I was rifht, but after translating "Poste optique" as "Optic station", it must be what I called "Central calculator", not "Range finder".
It was a part of the fire control system, the sighting mount was used in finding the target and tracking it.
The mount gave the target movement, side and height angles that were transfered to the actual predictor.
The system also needed range finder and at some models a separate speed indicator.
We finns bought a similar looking mounting with the ex-French Aufiere fire control systems from Germans during the WWII.
Even bigger units were used.John Hilly wrote:The heavy batteries had RFs 2 meter wide.
For instance the Aufiere system had a 4m range finder.