History lesson (Burt, correct me where appropriate; my memory is a little hazy this far back): My father also had two Memphis ROCs. The second one he found in the 60s in a V-tail Bonanza in the small town in Alabama where he had grown up. [I don't know where the Memphis instruments--referred to, I believe, because the manufacturer (Aircraft Indicators?) was located in that city--were installed but the early Bonanzas were a common location] He persuaded the owner to let him swap the Memphis for a brand new Kollsman ROC and she was happy to.

A club member in the Soaring Society of Dayton (predecessor of Caesar Creek) named Bill Coverdale (brother, IIRC, of Miles Coverdale, who was active in the SSA) quickly removed what he referred to as the "chokes" (restrictors) and, voila, a self-contained, sensitive rate of climb. The Memphis was the backup in many competition cockpits in those days.

Chip Bearden
ASW 24 "JB"
U.S.A.