{HEAD ~ The secondary core}, together with the primary core, forms {TAIL ~ the closed magnetic circuit}, in which a core main portion of the secondary core is formed in a shape of straight beam and the end faces at the end of the secondary core located at both ends in the longitudinal direction of the core main portion are held in contact with the primary core 
forms
{ HEAD ~ The secondary core } , together with the primary core , forms { TAIL ~ the closed magnetic circuit } , in which a core main portion of the secondary core is formed in a shape of straight beam and the end faces at the end of the secondary core located at both ends in the longitudinal direction of the core main portion are held in contact with the primary core
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