Smoke detector

Claim 1

A FORWARD LIGHT SCATTER SMOKE DETECTOR COMPRISING A HOUSING HAVING FRONT AND REAR PORTIONS, INLET AND OUTLET MEANS FOR THR HOUSING, A LIGHT CHAMBER IN THE REAR PORTION OF THE HOUSING, A SOURCE OF LIGHT IN THE LIGHT CHAMBER, AN APERTURED WALL FOR THE LIGHT CHAMBER, A LENS IN THE APERTURED WALL OF THE LIGHT CHAMBER, THE LENS HAVING A FOCAL POINT LOCATED WITHIN THE HOUSING, A TUBE IN AXIAL ALIGNMENT WITH THE LENS AND ADAPTED TO RESTRICT THE BEAM OF LIGHT PASSING THERETHROUGH,A VIEWING WINDOW IN THE WALL OF THE FRONT PORTION OF THE HOUSING IN ALIGNMENT WITH THE AXIS OF THE TUBE FOR VISUAL SUPERVISION OF THE LIGHT SOURCE, A MOVABLE AIR CURRENT FLOW INDICATOR MEMBER LOCATED IN THE FRONT PORTION ADJACENT THE VIEWING WINDOW IN THE PATH OF LIGHT PASSING THROUGH THE TUBE, THE INLET LOCATED IN THE FRONT PORTION OF THE HOUSING AND DIRECTED TOWARDS THE AIR CURRENT FLOW INDICATOR, AN APERTURED PARTITION EXTENDING ACROSS THE HOUSING LOCATED AT THE FOCAL POINT OF THE LENS AND POSITIONED BETWEEN THE TUBE AND THE VISUAL SUPERVISION VIEWING WINDOW, A TRANSLUCENT MEMBER POSITIONED ADJACENT THE APERTURED PARTITION, MEANS TO MOVE THE TRANSLUCENT MEMBER INTO AND AWAY FROM A POSITION INTERCEPTING THE PASSAGE OF THE BEAM OF LIGHT DIRECTED TOWARDS THE APERTURE AND THE VIEWING WINDOW, THE OUTLET LOCATED IN THE REAR PORTION OF THE HOUSING, MEANS ADAPTED TO PASS AIR TO BE TESTED FOR SMOKE FROM THE INLET TO THE OUTLET THROUGH THE APERTURE OF THE PARTITION, A SECOND VIEWING WINDOW FOR VISUAL DETECTION OF SMOKE, AND A PHOTOELECTRIC ELEMENT, BOTH THE SECOND VIEWING WINDOW AND THE PHOTOELECTRIC ELEMENT POSITIONED IN THE FRONT PORTION OF THE HOUSING AT ANGLES LESS THAN RIGHT ANGLES WITH RESPECT TO THE AXIS OF SAID TUBE OUTWARDLY OF THE BEAM OF LIGHT AND DIRECTED IN VIEWING POSITION TOWARDS THE APERTURE OF THE PARTITION WHEREBY LIGHT SCATTERED BY PARTICLES OF SMOKE IS DIRETED TOWARDS THE SECOND VIEWING WINDOW AND TOWARDS THE PHOTOELECTRIC ELEMENT.