Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC is a 38-page photocopy covering

is a 38-page photocopy covering basic troubleshooting

The main pointer rotates clockwise as the airspeed increases

This is a crash relic believed to be from a WWII Soviet Air Force Yakovlev Yak 7 recovered from its crash site in Poland

true air speed

We have not attempted to test the clock's other functions

Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC is a 38-page photocopy coveringHere 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