That thing is really complicated...
The compass in base is to set wind drif (in CloD replicate pilot cockpit compass).
http://canadianflight.org/files/bombsight1.pdf
Good pictures here: http://www.ebay.co.uk/itm/3015369079...173&rmvSB=true
"The type D bomb sight compass .... The north filament is bent so as to form a cross wire at about one-third of its length away from the frame and is painted red;
the south filament is painted black and the other two filaments are painted white."
"(iii) Unlock the bearing plate and rotate it to set “red on red”, i.e., the red marked north point on the bearing plate vertically over the red compass filament. "
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