A NEW aircraft instrument has been produced by Mr. Pollock Brown which, it is claimed, combines the functions of turn indicator and fore‐and‐aft level. The details of the “P.B. Deviator,” as the device is called, can bo seen in the accompanying drawing.
(1931), "A New Turn Indicator: A Gyroscopic Instrument with an Ingenious Mounting and Fluid‐Friction Drive of General Application", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 6, pp. 146-146. https://doi.org/10.1108/eb029411
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