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Claim 1

A SWITCH COMPRISING A SUBSTANTIALLY SOLID BLOCK DEFINING SPACED RECEPTACLES AND A PASSAGE CONNECTING SAID RECEPTACLES, SAID BLOCK BEING FURTHER PROVIDED WITH AN ELONGATED RECTILINEAR INTERIOR SLIDEWAY OF PREDETERMINED LENGTH AND BREADTH, SAID SLIDEWAY BEING LOCATED BETWEEN SAID RECEPTACLES AND IN INTERSECTING RELATIONSHIP WITH SAID PASSAGE, A LIGHT SOURCE IN ONE OF SAID RECEPTACLES, A LIGHT RESPONSIVE ELEMENT IN THE OTHER OF SAID RECEPTACLES, SAID LIGHT SOURCE BEING ADAPTED FOR TRANSMITTING LIGHT VIA SAID PASSAGE TO SAID LIGHT RESPONSIVE ELEMENT, A LIGHT INTERCEPTING ELEMENT RECTILINEARLY DISPLACEABLE IN SAID SLIDEWAY BETWEEN A NORMAL POSITION OF REST AND AN ACTIVE POSITION FOR SELECTIVELY BLOCKING LIGHT TRANSMITTED BY SAID SOURCE, SAID LIGHT INTERCEPTING ELEMENT BEING SUPPORTED BY SAID BLOCK AND EXTENDING EXTERNALLY THEREOF, AND MEANS WITHIN SAID BLOCK ENGAGING THE LIGHT INTERCEPTING ELEMENT AND YIELDABLY HOLDING THE SAME IN SAID NORMAL POSITION OF REST IN WHICH THE LIGHT INTERCEPTION ELEMENT EXTENDS MOST FULLY FROM THE SAID BLOCK, SAID LIGHT INTERCEPTING ELEMENT COMPRISING AN ELONGATED MEMBER IN SAID SLIDEWAY AND MEANS EXTENDING LATERALLY ON SAID ELONGATED MEMBER AND SPACED LONGITUDINALLY THEREOF AT A DISTANCE GREATER THAN SAID PREDETERMINED LENGTHS SO THAT SAID ELONGATED MEMBER IS ADAPTED FOR LIMITED DISPLACEMENT IN SAID SLIDEWAY, SAID BLOCK CONSTITUTING WITH SAID LIGHT SOURCE, LIGHT RESPONSIVE ELEMENT AND LIGHT INTERCEPTING ELEMENT A PORTABLE SELFCONTAINED UNIT.