1. IN A SHORT CIRCUITER, SAID SHORT CIRCUITER COMPRISING A PLURALITY OF STATIONARY CONTACTS NORMALLY ELECTRICALLY INSULATED FROM ONE ANOTHER AND A RELATIVELY MOVABLE CONTACT; EACH OF SAID PLURALITY OF STATIONARY CONTACTS HAVING A CONTACT SURFACE; SAID CONTACT SURFACES OF SAID STATIONARY CONTACTS DEFINING THE PERIPHERAL SURFACE OF A TRUNCATED CONE, COMPLEMENTARY WITH RESPECT TO SAID MOVABLE CONTACT; SAID MOVABLE CONTACT HAVING A CONICALLY SHAPED CONTACT SURFACE COMMON TO EACH OF SAID CONTACT SURFACES OF SAID PLURALITY OF STATIONARY CONTACTS; SAID CONICALLY SHAPED CONTACT SURFACE OF SAID MOVABLE CONTACT AND SAID TRUNCATED CONE DEFINED BY SAID STATIONARY CONTACT SURFACES HAVING A COMMON AXIS; SAID MOVABLE CONTACT BEING MOVABLE TO AN ENGAGED POSITION WITH SAID PLURALITY OF STATIONARY CONTACT ALONG SAID AXIS; SAID CONTACT SURFACES OF SAID STATIONARY CONTACTS HAVING GROOVES; SAID CONTACT SURFACE OF SAID MOVABLE CONTACT HAVING GROOVES; SAID GROOVES IN SAID MOVABLE CONTACT BEING TRANSVERSE TO SAID GROOVES IN SAID PLURALITY OF STATIONARY CONTACTS.