Abstract: An edible educational aid comprised of a body of edible material configured into the form of a recognizable object, and containing within its interior mass, an inner core of material designated to identify the object in which the body is configured to resemble. With the employment of the embodiments, the benefits of learning object recognition, spelling, reading, and mathematics are enjoyed thru the consumption of an edible article by a person, especially a child.

Abstract: A plasma torch circuit includes a control for initially setting the torch at a desired height above a workpiece during the time the non-transferred arc exists between the torch cathode and the torch tip. Measurement is made of the voltage between the cathode and the workpiece, and that voltage is compared to an input for controlling torch height. During transferred arc operation, a reference is initially created by storing the cathode-to-workpiece voltage occurring immediately after the transferred arc is turned on, and using the latter stored voltage as a reference for torch height maintenance.