Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC true air speed

true air speed

The main pointer rotates clockwise as the airspeed increases

We have not found documentation of its use

This example is definitely experienced by in good condition given its age

The Special Devices Section grew and became the Special Devices Division

Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC true air speedHere is a Turn and Slip Indicator, Mark IA, Type 6A 675, invented by George Reid (according to the 'all knowing' Wikipedia) and made by Reid & Sigrist, as used on the blind flying panel of aircraft of the British Royal Air Force and the Royal Australian Air Force of WWII. It is an early version as evidenced by the all white markings; later versions had both white and green markings on the face. The Mark IA was used across numerous British aircraft