Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer so theoretically it's possible that

so theoretically it's possible that this was used in a Boeing bomber B-50 Superfortress (developed from the B-29) which was in service during this period

(c) aural reception of modulated or unmodulated radio frequency energy using a loop antenna (d) aural-null directional indications of the arrival of modulated or unmodulated radio frequency energy using a loop antenna

Both have operating ranges painted on the glass for the last aircraft in which they were installed

This aligns with the total fuel capacity of the B-52 B

Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer so theoretically it's possible thatWe 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