Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer 25 inches diameter and ~

25 inches diameter and ~ 2

The pressure tubes have been bent sideways for an unknown reason

(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

plus the spares

Calculateur de Parallaxe / Parallax Berekenaar (Parallax Calculator) PB4Y Privateer 25 inches diameter and ~We 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