As the critical altitude was passed a pressure-operated aneroid capsule operated the gearbox, which changed speed to " "'Full Supercharger " ( F . S . ) "'gear, which drove the impellers faster, thus compressing a greater volume of the air-fuel mixture.
2.
Two-stage refers to the use of two impellors in American parlance . | group = nb } } on a common driveshaft in effect constituting two superchargers in series; a aneroid capsule operated the gearbox which changed up to " high blower ", driving the impellors faster, compressing a greater volume of the air-fuel mixture . | group = nb } } This second stage blower required approximately to drive it.
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