Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer If it were a Nose

If it were a Nose angle indicator

This has been confirmed in the F-80 Illustrated Parts Manual dated 1958

and the right dial is labeled with the Japanese character for "Thousands"

The pressure tubes have been bent sideways for an unknown reason

Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer If it were a NoseWe frankly have no idea exactly in which specific application this Parallax Calculator was used (aeronautical or astronomical or ?). This large device measures ~13 inches square and has 3 clear disks and 1 clear arm that rotate around a center axis affixed to a metal rimmed wooden base board with what appears to be measurements of deflection. The disks may be secured by turning the 4 metal knobs. It is labeled in French and Dutch. A cool piece