5. AN IMPROVED ELECTRICAL SEQUENTIAL SWITCH ADAPTED TO OPERATE IN SPACE VEHICLES IN FLIGHT AND SUBJECT TO AXIAL AND ANGULAR ACCELERATION AND ANGULAR VELOCITY TO A HIGH DEGREE, COMPRISING IN COMBINATION, TWO SETS OF INSULATED ELECTRICAL CONTACTS MOUNTED IN FIXED RELATION TO EACH OTHER A PAIR OF RELATIVELY LIGHT LOW-MASS SWITCHING ELEMENTS OF THIN INSULATING MATERIAL ONE INTERPOSED BETWEEN EACH SET OF SAID CONTACTS, AND SWITCHING ELEMENTS HAVING A COMMON AXIS OF ROTATION AND CONTACT OPENINGS FOR PERMITTING SAID SETS OF CONTACTS TO ENGAGE AND BE CONNECTED THROUGH THE RESPECTIVE ELEMENT ASSOCIATED THEREWITH WHEN MOVED TO THE ON POSITION, AND THE SAID AXIS OF SAID SWITCHIN ELEMENTS BEING OFFSET FROM THE AXIS OF SPIN OF A SPACE VEHICLE IN WHICH SAID SWITCH IS MOUNTED TO DEVELOP A COMPONENT OF FORCE TENDING TO MOVE SAID SWITCH ELEMENTS FROM THE OFF TO THE ONPOSITION, TIMING CONTROLLED MEANS FOR LOCKING SAID SWITCH ELEMENTS IN THE OFF POSITION, AND FOR SEQUENTIALLY RELEASING SAID ELEMENTS TO CLOSE FIRST ONE AND THEN THE OTHER OF SAID SETS OF CONTACTS IN SPACED SEQUENTIAL TIMED RELATION.