1. AN ELECTROMAGNETIC CONTACT-MAKING RELAY INCLUDING AN OUTER MAGNETIC MEMBER, AN INNER MAGNETIC MEMBER PASSING THROUGH AN APERTURE IN THE OUTER MAGNETIC MEMBER AND ELECTRICALLY AND MAGNETICALLY INSULATING THEREFROM, AND A RESILIENT DIAPHRAGM OF MAGNETIC MATERIAL SECURED AT ITS PERIPHERY TO THE OUTER MAGNETIC MEMBER AND HAVING A DISTINCT CONTACT AREA NORMALLY SPACED FROM THE INNER MAGNETIC MEMBER, SAID INNER MAGNETIC MEMBER BEING FORMED AS A TUBE HAVING AN OPEN END, THE DIAPHRAGM AND THE OPEN END OF THE INNER MAGNETIC MEMBER CONSTITUTING THE CONTACTS OF THE RELAY AND BEING CAPABLE OF BEING BROUGHT INTO CONTACT WITH EACH OTHER BY THE ENERGIZATION OF A MAGNETIC CIRCUIT THAT INCLUDES THE SAID TWO MAGNETIC MEMBERS AND THE DIAPHRAGM.