Abstract: A starting circuit for a single-phase induction motor having a start capacitor, an auxiliary or start winding, and a run winding includes user adjustable pick-up voltage means to allow a user to select a pick-up voltage in the field to correspond to the pick-up voltage of a particular induction motor such that a relay disconnects the start winding from the power supply when the start winding voltage exceeds the selected pick-up voltage. Protective circuitry is provided including a timing circuit to protect from missetting of the pick-up voltage or when the motor will not start for any reason and a relay current circuit to control the current flowing in the relay to protect from high voltage overloading.

Abstract: Apparatus is disclosed in which a digital display is driven by an electronic output generated in response to field changes which occur when a transformer interacts with a magnetic core driven in a linearized path by a curved Bourbon tube in response to applied ambient pressure. The transformer is a simple variable transformer and the core is configured to follow a radial path within the field of the transformer.