Drift Sight, Tail, RAF Mk IV Kit Ref No 6B/110, 1939 Viscount Virtually the same aircraft

Virtually the same aircraft

There were two complete M6 periscopes in brackets on the turret walls

and ~4 inches and 5 inches wide

Here is an early WWII-era Airspeed Indicator

intersecting them along the specified firing range

Drift Sight, Tail, RAF Mk IV Kit Ref No 6B/110, 1939 Viscount Virtually the same aircraftHere is a WWII era Tail Drift Sight, Mark IV Kit, as used in bomber and transport aircraft of the British Royal Air Force with navigator aircrew, such as the Avro Lancaster, and likely used in other bombers such as the Vickers Wellington and Short Stirling. This kit includes the optical periscope, a base plate, and the aluminum drift plate that screws onto the base plate, and wooden carry case with leather strap. Stamped on the label on the case of