Drift Sights, Mk II-B Pelorus, and Mk IIC with Recording Base UH-1 Liquidometer part number EA101-19 as

Liquidometer part number EA101-19 as illustrated on in the US Army Air Force's Flight Manual

Typically mounted on the rear housing of a 50 cal machine gun from a side/waist gun position in the aircraft

25 inches diameter and 3 inches deep

and the lines leading from bottom center to each light is a wire to the light

It is in exceptional cosmetic condition for its age

Drift Sights, Mk II-B Pelorus, and Mk IIC with Recording Base UH-1 Liquidometer part number EA101-19 asHere are two types of 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 in flight,