Auto-Hand Tab

[punkalouver]

Was looking over a cutaway diagram for an Airspeed Ambassador and notice the name of the trim tab on the center vertical tail rudder used this terminology. Auto-Hand Tab.

Any old Ambassador pilots or mechanics know why it is called this. Or has anybody seen this used on other aircraft.

[Amadis of Gaul]

Sweet Heavens! Didn't expect to see an Airspeed Ambassador question on here, that's for sure.:)