1. ADJUSTABLE SWITCHING APPARATUS COMPRISING: A FIRST INSULATING SHEET OF WHICH IS AFFIXED ON ONE SIDE THEREOF AT LEAST ONE FIXED CONDUCTIVE SWITCH CONTACT; A SECOND INSULATING SHEET OF WHICH IS AFFIXED ON ONE SIDE THEREOF AT LEAST ONE FIXED CONDUCTIVE SWITCH CONTACT; A ROTATABLE INSULATING DISC HAVING AN APERTURE WHICH EXTENDS THERETHROUGH FROM ONE SIDE TO THE OTHER; MEANS INCLUDING A SHAFT FOR SUPPORTING SAND ALIGNING SAID FIRST AND SECOND INSULATING SHEETS AND SAID DISC IN PARALLEL SPACED APART RELATION SUCH THAT SAID DISC IS JOURNALLED ON SAID SHAFT BETWEEN SAID FIRST AND SECOND INSULATING SHEETS FOR ROTATION AS BETWEEN AT LEAST A PLURALITY OF DIFFERENT DISCRETE POSITIONS AND THE SIDES OF SAID INSULATING SHEETS, TO WHICH SAID FIXED CONTACTS ARE AFFIXED, ARE ADJACENT EACH OTHER; SAID INSULATING DISC HAVING A MANUAL CONTROL TAB EXTENDING IN A DIRECTION PERPENDICULAR TO ITS AXIS OF ROTATION TO FACILITATE ADJUSTMENT FROM ONE POSITION TO THE NEXT AND ALSO HAVING A PLURALITY OF DETENT NOTCHES ON ITS PERIPHERY CORRESPONDING TO THE PLURALITY OF DIFFERENT POSITIONS OF SAID DISC; A MOVABLE CONTACT PIN RETAINED IN SAID APERTURE OF SAID ROTATABLE INSULATING DISC AND, IN AT LEAST ONE POSITION OF SAID DISC, ENGAGING AND ELECTRICALLY INTERCONNECTING THE FIXED CONTACTS OF SAID FIRST AND SECOND INSULATING SHEETS; A RESILIENT DETENT WHICH MATES WITH A DIFFERENT NOTCH ON THE PERIPHERY OF SAID INSULATING DISC IN EACH DIFFERENT POSITION OF SAID DISC; AND RESILIENT MEANS FOR URGING ONE OF SAID FIRST AND SECOND INSULATING SHEETS TOWARD THE OTHER.