Drift Sight, Mk II-B Pelorus, WWII US Navy Aircraft NOS Short Stirling This one was made specifically

This one was made specifically for aircraft of the US Navy

including heavy bombers B-17 and B-24

showing the location of the clock

General Electric part number 8DJ4PWE

Here is a WWII-era Chronometric Tachometer / Disk Speed Indicator Kit

Drift Sight, Mk II-B Pelorus, WWII US Navy Aircraft NOS Short Stirling This one was made specificallyHere is an early WWII era US Navy aircraft Mk II B 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