An electric induction heating apparatus for heating a gear-like article having an annular region of one or more discrete protrusions from a surface of the gear-like article, the apparatus comprising: an at least one turn induction coil comprising: an outer coil segment having an outer coil segment face opposing, at least in part, a radially outer region of the annular region of the one or more discrete protrusions, the outer coil segment having outer coil segment outer and inner ends, the outer coil segment being arranged to inductively heat the radially outer region of the one or more discrete protrusions; and an inner coil segment having an inner coil segment face opposing, at least in part, a radially inner region of the annular region of the one or more discrete protrusions, the inner coil segment having inner coil segment outer and inner ends, the inner coil segment being arranged to inductively heat the radially inner region of the one or more discrete protrusions; an alternating current source connected between the outer ends of the outer coil segment and the inner coil segment; and a means for rotating the gear-like article; characterised by: a transition coil segment connected between the inner ends of the outer coil segment and the inner coil segment, the transition coil segment having a transition coil segment face opposing a transverse region of the annular region and disposed relative to the gear-like article so as to transverse at least partially across the length of the one or more discrete protrusions to inductively heat the transverse region of the one or more discrete protrusions. an at least one turn induction coil comprising: an outer coil segment having an outer coil segment face opposing, at least in part, a radially outer region of the annular region of the one or more discrete protrusions, the outer coil segment having outer coil segment outer and inner ends, the outer coil segment being arranged to inductively heat the radially outer region of the one or more discrete protrusions; and an inner coil segment having an inner coil segment face opposing, at least in part, a radially inner region of the annular region of the one or more discrete protrusions, the inner coil segment having inner coil segment outer and inner ends, the inner coil segment being arranged to inductively heat the radially inner region of the one or more discrete protrusions; an alternating current source connected between the outer ends of the outer coil segment and the inner coil segment; and a means for rotating the gear-like article; characterised by: a transition coil segment connected between the inner ends of the outer coil segment and the inner coil segment, the transition coil segment having a transition coil segment face opposing a transverse region of the annular region and disposed relative to the gear-like article so as to transverse at least partially across the length of the one or more discrete protrusions to inductively heat the transverse region of the one or more discrete protrusions. an outer coil segment having an outer coil segment face opposing, at least in part, a radially outer region of the annular region of the one or more discrete protrusions, the outer coil segment having outer coil segment outer and inner ends, the outer coil segment being arranged to inductively heat the radially outer region of the one or more discrete protrusions; and an inner coil segment having an inner coil segment face opposing, at least in part, a radially inner region of the annular region of the one or more discrete protrusions, the inner coil segment having inner coil segment outer and inner ends, the inner coil segment being arranged to inductively heat the radially inner region of the one or more discrete protrusions; an alternating current source connected between the outer ends of the outer coil segment and the inner coil segment; and a means for rotating the gear-like article; a transition coil segment connected between the inner ends of the outer coil segment and the inner coil segment, the transition coil segment having a transition coil segment face opposing a transverse region of the annular region and disposed relative to the gear-like article so as to transverse at least partially across the length of the one or more discrete protrusions to inductively heat the transverse region of the one or more discrete protrusions.