Drift Sight, Mk II-B Pelorus, WWII US Navy Aircraft Sally Bomber 25 inches diameter and ~4inches

25 inches diameter and ~4inches deep

It is a wonderful reference document from that era

Of clear plexiglas

This is a Gyrosyn Compass Master Indicator Type C

Drift Sight, Mk II-B Pelorus, WWII US Navy Aircraft Sally Bomber 25 inches diameter and ~4inchesHere is an early WWII era US Navy aircraft Pelorus Drift Sight. A Pelorus Drift Sight is designed to function either as a Pelorus, for taking bearings on objects, or for improving dead reckoning aircraft navigation by measuring the angle between the heading and the track of an airplane. It consists of a small 'telescope' viewing vertically towards the ground, angled toward the direction of the aircraft. When viewing the ground through the scope while