Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC contains an elevator potentiometer and

contains an elevator potentiometer and a gear train which were the interface between the commands given by the action of the stick and the downstream C-1 system

is a 38-page photocopy covering basic troubleshooting

25 inches diameter and ~5 inches deep

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

true air speed

Turn and Slip Indicator, Mk IA, 6A/675, RAF BOAC contains an elevator potentiometer andHere 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