MERCURY SWITCH

摘要

A mercury switch in which a magnetic armature and a magnetic pole having a fixed contact are inserted in a glass tube, mercury is introduced into the glass tube to wet the contact point, and both ends of the glass tube are sealed. A recessed portion is formed in a portion of the magnetic pole and the fixed contact is adhered into the recessed portion. A film of a metal oxide which will be only slightly wetted with mercury is formed on the surface of the magnetic pole except on the surface of the fixed contact.